Digatron DT-40K User manual

TABLE OF CONTENTS
Introduction ..............................................................................1
Sensor Installation ...................................................................2
Electrical Interference..............................................................3
Power On...................................................................................4
Display Resolution...................................................................4
Monitoring and Recording.......................................................5
Ways to Begin Recording........................................................6
Information about Recording..................................................6
Acknowledging Overlimit Condition ......................................7
Reset Lap and Event Number and Clear Memory .................7
Analyze Data.............................................................................8
Lap Times and Maximums.......................................................8
Detailed Review of a Lap .........................................................9
Power Off ..................................................................................9
Appendix A: Sensor Installation.............................................10
Tach Sensor..........................................................................10
CHT Sensor...........................................................................12
EGT Sensor...........................................................................12
Beacon Receiver...................................................................13
Beacon Transmitter..............................................................13
Manual Lap Switch ...............................................................14
Battery ...................................................................................14
Steering Wheel Mount..........................................................14
Appendix B: Setting Limits .....................................................15
Tach
.....................................................................................
15
CHT
.....................................................................................
16
EGT
.....................................................................................
16
Ignoring Multiple Beacons...................................................16
Appendix C: Button Functions ...............................................17
Troubleshooting.......................................................................19
Repairs
.....................................................................................
21
ENGINE MONITORING SYSTEMS
DT-40K
INSTRUCTION MANUAL

TABLE OF CONTENTS
Introduction ..............................................................................1
Sensor Installation ...................................................................2
Electrical Interference..............................................................3
Power On...................................................................................4
Display Resolution...................................................................4
Monitoring and Recording.......................................................5
Ways to Begin Recording........................................................6
Information about Recording..................................................6
Acknowledging Overlimit Condition ......................................7
Reset Lap and Event Number and Clear Memory .................7
Analyze Data.............................................................................8
Lap Times and Maximums.......................................................8
Detailed Review of a Lap .........................................................9
Power Off ..................................................................................9
Appendix A: Sensor Installation.............................................10
Tach Sensor..........................................................................10
CHT Sensor...........................................................................12
EGT Sensor...........................................................................12
Beacon Receiver...................................................................13
Beacon Transmitter..............................................................13
Manual Lap Switch ...............................................................14
Battery ...................................................................................14
Steering Wheel Mount..........................................................14
Appendix B: Setting Limits .....................................................15
Tach
.....................................................................................
15
CHT
.....................................................................................
16
EGT
.....................................................................................
16
Ignoring Multiple Beacons...................................................16
Appendix C: Button Functions ...............................................17
Troubleshooting.......................................................................19
Repairs
.....................................................................................
21

Digatron’s DT-40K Instruction Manual
Introduction
Congratulations on the purchase of your
new DT-40K. The DT-40K is Digatron’s
small, easy to use, multi-function, digital
engine monitoring system.This instrument
was designed for the customer who wants
to know how their engine is functioning
without spending a lot of time and money.
Depending on which version of this
instrument you purchased, it can monitor
any combination of the following functions:
cylinder head temperature (CHT) or water
temperature (WT), exhaust gas temperature
(EGT) and tachometer (Tach). It datalogs
all of these inputs, along with lap times.
Lap times can be stored manually or with a beacon (both optional).All of this
information can then be played back on the DT-40K.
Included with your instrument is a simple instruction sheet that allows you to
quickly install and use your Digatron DT-40K. The instructions in this booklet
are more detailed to help you learn all of the capabilities of your new instrument.
1

2
Sensor Installation (General)
These instructions cover all the sensors that can be used with the DT-40K. Some
may not pertain to your particular model.
• Tach Sensor: Must be hooked up for instrument to work correctly.
• Temperature Sensors: If not used, use a shorting plug.
• Timing Input,White Boot: Use receiver and beacon or manual switch. It
is okay to leave this input open.
Tach and temperature inputs that are left open can cause erratic readings
and possible instrument damage.
Sensor cables that run from the engine compartment to the instrument should
always be routed as far away from the ignition system components as possible
(plug wires, spark plugs, ignition coils, distributor or magneto). Sensor cables too
close to these components may pick up radiated electrical interference and cause
erratic instrument readings and operation. A distance of at least 6˝ from these
components is desirable in all installations.
When routing sensor cables through any panels, be sure to use a rubber grommet
to keep the cables from being cut by a sharp edge. It is also good practice to
protect all of the sensors with a short piece of fuel line at any point that the cable
may rub against a hard surface.
If any of your cables are too long to route back to your instrument fully extended,
we recommend sending your sensors back to Digatron to be cut to the appropriate
length for your needs.You can also coil them each separately. If you do coil your
sensors, keep the coils away from the engine.
For detailed information about installing each sensor, see Appendix A.

Fig. 8
An instrument displaying EGT that has
encountered electrical interference. Shown by
the ERR annunciator
3
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Electrical Interference
If the instrument encounters excessive electrical interference it will display ERR
on the left side of the display. (see Fig. 8) This indicates that the stored data might
be invalid. Press the Function button, then turn the instrument off for 30 seconds.
After turning the instrument back on, check that it is working properly. If it is
not, turn the instrument off and back on again. Immediately after turning the
instrument on, press the and the Max/Event buttons to reset the instrument.
When the display flashes PrS PLA, press the Play/Pause button. The error should
now be cleared and memory is erased.
The ERR annunciator can also indicate an incorrect instrument or sensor installation.
Severe electrical interference can cause the limits and calibration to reprogram
themselves. If your instrument is doing strange things, put it in Set Limits and
check to see that the limits and calibration are still where you set them. (see
Appendix B)
Electrical interference problems can normally be solved by installing a
resistance plug boot. We recommend using an NGK boot, # LB05EMH.
To avoid erratic readings:
• Keep your temperature and Tach leads separated by at least 3˝. Do not wrap 
leads together, this can induce interference into the system. 
• Route the leads as far away from the coil as possible. 
• Install the Tach lead on the plug wire at least 2˝ back from the plug boot.
If you still have a problem, try a different location on the plug wire.
• Running your leads through separate sections of fuel line will protect them
from cuts and abrasions, but will not shield them from ignition generated
interference.
• Be sure that all sensors are connected to the instrument, and that all connectors
fit together snugly. Any functions not being used must have a plug on the
pigtail.
Please contact Digatron if the problem continues.

4
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Power On
There are two ways for your instrument to be powered on: 
• The unit will turn on and begin recording automatically when the engine is
started.
• The unit can be turned on with the Exit/Power button before the engine is
started. It will then begin recording when the Lap switch is pressed or it
passes a beacon (if you are using a receiver). Also, when the engine is
running, the Exit/Power button can start and stop recording.
Display Resolution
When the instrument is powered on, the display is in high resolution. 
• To change the display resolution, press the and the buttons at the same 
time.
High Resolution:
• Highest number displayed is 1:59.9
• After that time, the instrument continues to record, and the 1 on the left of
the display toggles every other minute.
Low Resolution:
• Highest number displayed is 19:59
• The instrument continues to record after this amount of time and the 1 on
the left of the display toggles every 20 minutes.
Setting Limits and Calibration Number
Before using your DT-40K, be sure to set the operating limits for each input.
Limits allow the instrument to give you a visual warning (the display flashes) if
any of the inputs exceed their limit.
For detailed information on setting limits seeAppendix B.

Fig. 4a
Display showing
lap# 23
Fig. 4b
Display showing
event # 6
5
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Monitoring and Recording
When your instrument is powered on, it is monitoring your engine functions and
ready to begin recording.
The instrument will visually warn you, by flashing the display, if your engine
exceeds any of it’s set limits. These limits allow you to avoid engine damage.You
can make quick tuning adjustments to your engine that allow you to run safe and
fast.
Recording information is very simple and once you have started recording, you
can change what function is being displayed. Laps are recorded manually with
the Lap switch or automatically when a beacon is passed, if you have a beacon
receiver and transmitter.
Note: The memory of this instrument holds 35 minutes of information. After that
amount of time, the instrument will keep recording and begin writing over the
oldest previously recorded data. 
• Change Function Displayed: Press the Function button to change what is
being displayed. It cycles through the functions in this order: CHT/WT,
EGT, RPM, Lap # and Lap Time. (Not all instruments have all of these
functions.)
• Stop Recording: Press the Exit/Power button, or turn your engine off, to
stop recording and end the current Event.
• Backlight:The backlight is used to illuminate your display for use at night.
Press the button to toggle the backlight on or off.The backlight can only
be turned on or off while in Monitor/Record mode.
• Maximums: The Max/Event button is used to display the maximum reading
for each engine function and the Event number in progress.
1.If the instrument is displaying an engine function and you press the 
Max/Event button, it will display the maximum reading for that
function since the instrument was turned on.
2.If the instrument is displaying Lap # (display shows L and two
or three numbers, see Fig. 4a) and you press the Max/Event button,
it will display the current Event number. (display shows E and two
numbers, see Fig. 4b)

6
Begin Recording
There are three ways to begin recording data:
1.Starting the engine while the instrument is turned off, automatically starts
the instrument and begins recording the Event.
2.Manually turn the instrument on with the Exit/Power button before the
engine is started. Press the Lap switch or the Exit/Power button to begin
recording. (The instrument must be receiving a Tach signal to begin recording
with the Exit/Power button. If it does not have a Tach signal, pressing this
button will turn the instrument off.)
3.Manually turn the instrument on with the Exit/Power button before the
engine is started. When the vehicle passes a beacon, the instrument will
begin recording, if you have a beacon receiver on your vehicle.
Information about Recording
When the instrument is recording, it can ignore multiple beacons on the track.
After receiving a signal, the instrument will ignore any other beacon signal for
the number of seconds entered in Set Limits (see Appendix B). After the number
of seconds has passed the instrument will register the next beacon signal it receives
and then begin ignoring again.
When you finish a lap, while the instrument is recording, it will display the total
time for the last lap for three seconds, before returning to the previously displayed
data. If you are displaying Lap Time while recording, the instrument will
continuously display the time of the last lap. To show running time for the current
lap, press the Max button. When the clock is running, a colon will flash in the
display.
Turning off the engine or pressing the Exit/Power button terminates the current
lap and the current Event. A new Event is started when the instrument starts
recording again. When the unit is turned off, it does not lose it’s data. When it
begins recording again, it will start a new Event on Lap one, at the end of the last
recorded Event.After 35 minutes of total record time, the instrument will begin
recording over oldest previously recorded data.
Note: The instrument will not record while the PRS (PReviouSly recorded data)
annunciator is visible on the left side of the display. The PRS annunciator shows
that the instrument is in Playback. Press the Exit/Power button until PRS is not
displayed to return to monitoring the engine and recording.

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7
Acknowledging an Overlimit Condition
When one of the functions of your instrument exceeds it’s set limit, the instrument
will display that function and flash the display. To return the instrument to the
function that was displayed before the overlimit condition, press any button.Your
engine may still be running over the set limit, but the instrument will not display
that condition after you press a button. If the function goes below the set limit
and then again exceeds the limit, the instrument will again display and flash the
over limit function.
Reset Lap and Event Number and Clear Memory
To reset the lap and event number to zero and clear all recorded data, press the
and the Max/Event buttons at the same time. When the display flashes PrS
PLA, press the Play/Pause button. Any recorded data is now cleared from your
instrument. Limits are not cleared. If you do not press the Play/Pause button
within 5 seconds the reset will be aborted.
Note: The memory is not automatically reset when you turn the instrument off.
All data is retained when the instrument is turned off and even when the batteries
are removed.

Fig. 5
Display in Playback
showing RPM
8
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Fig. 6
Display showing
lap 18 selected PRS
Analyze Data
There are two ways to look at the recorded information:
1. View maximum readings and lap times for each lap.
2. Play the selected lap.
Note: PRS (PReviouSly recorded data) is visible on the left side of the display
during both of the above. (see Fig. 5)
Lap Times and Maximums
To review lap times and maximum readings for each lap:
• Enter Laps: When in the basic monitoring mode, press the Play/Pause
button to view lap times and maximums for each lap. Lap numbers are
represented by an L on the display. (see Fig. 6)
• Change Laps: Press the or button to change the lap number being
displayed. If you are viewing the last lap of an Event, the button moves
you to the first lap of the next Event. If you are at the first lap of an Event,
the button moves you to the last lap of the previous Event. 
Note: If your display shows the word LooP after pressing one of the arrow
buttons, this means that it is searching for the beginning of the next lap’s
information. 
• Max Readings: Press the Function button to cycle through all the functions
of the instrument. It will display the maximum readings for that lap.
• Event Numbers: When the display is showing Lap number, press the
Max/Event button to see which Event you are reviewing. (The display will
show E and two numbers.)
• Return to Monitoring: To return to the basic monitoring mode, press the
Exit/Power button.

Fig. 7
Display in playback
mode showing time
9
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Detailed Review of a Lap
You can review all of the detailed information recorded for the lap that was
selected in Laps. The information can be played back, for each function, in real
time or stepped through in 0.1 second increments. 
• Enter Playback: When in Lap/Max, press the Play/Pause button
to begin reviewing the data for the lap. The instrument will play back time
for the selected lap. (see Fig.7)
• Pause: Press the Play/Pause button to pause playback and again to resume
playback. (The information for this lap will continue to replay until this
button is pressed.)
• Change Direction: Press the or button to change the direction of
playback. If playback is paused, use the arrow buttons to step through the
data in 0.1 second intervals.
• Change Function: Press the Function button to view the different functions’
readings for this lap.
• Max Readings: Press the Max/Event button to review the maximum
readings for each function, the current Event number or the total lap time
for the current lap, depending on which function is being displayed. 
• Change Lap: To review a different lap’s data, press the Exit/Power button.
Use the arrow buttons to select a different lap.Then press the Play/Pause
button to begin reviewing data for the newly selected lap.
• Exit Laps: Press the Exit/Power button to return to Laps and press it again
to return to the basic monitoring mode.
Power Off
The unit can be turned off by pressing the Exit/Power button while it is in
Monitor/Record mode (if there is no Tach signal and it is not recording). The
instrument will turn itself off automatically after ten minutes if no keys have been
pressed and there has been no tach signal.
Note: All data is saved when the instrument is turned off.

10
APPENDIX A: Sensor Installation (detailed)
Tach Sensor Installation
Our standard Tach sensor can be installed on both two and four cycle engines.
For best results, keep the Tach sensor cable separated as much as possible from
all other cables running to your instrument.
Use a cable tie on the shrink tube, at the end of the green wire, to attach the sensor
to the plug wire, keeping the end at least 2" from the plug boot. Keep the sensor
electronics (colored band of plastic) away from any ignition component.Attach
the end of the black ground wire to bare metal on the engine block. Route the
sensor cable from the motor to your instrument, securing with cable ties. Plug
into the pigtail with the small “push-on” type connector.
Four cycle engines: The Tach sensor is a small antennae that picks up the energy
radiated by the spark plug wire. Four cycle engines produce weaker signals than
other engines.To receive a strong signal with a four cycle engine, spiral the colored
wire down the spark plug wire of the sensor. This creates the antennae.
Two cycle engines: These engines usually produce a strong signal. Attaching the
end of the Tach sensor to the spark plug wire should be sufficient to get a strong
reading. If it is not, spiral the colored wire down the spark plug wire.
For best results, keep the Tach sensor cable separated as much as possible from
any other cables running to your instrument.

Fig. 1a
Example of
standard
installation
Fig. 1b
Example of
Briggs
installation
11
Standard
Inductive Tach Sensor Installation
Low Energy Ignition
Inductive Tach Sensor
Installation
(Briggs)

Fig. 2
Spark plug with washer
removed & sensor in its
proper position
12
Install the spark plug finger tight to hold the sensor in position. Finish tightening
with a plug wrench to the same torque as normally recommended. Do not allow
the sensor to turn as you tighten the plug.The sensor is easily damaged if forced
into a cooling fin.
Route the sensor cable from the motor to the instrument. Secure the cable to the
frame of the kart with cable ties. Connect to the small, threaded pigtail on the
instrument and turn the connector until tight.
EGT Sensor Installation
Our standard EGT sensor is a type K thermocouple temperature sensor. Install
the sensor clamp assembly, or weld on, to the exhaust header. Position the clamp
so that the sensor will be in the center of the header and approximately 2˝ from
the head side of the exhaust flange. Using the fitting on the clamp assembly as
a drill bushing, drill a 3/16˝ hole through the header. Remove the clamp assembly
from the header and redrill the hole to 13/64˝. Reinstall the clamp assembly and
align it with the hole just drilled.
Insert the sensor into the fitting so that the tip of the sensor extends 1/4˝ past the
center of the header. Tighten the compression nut to lock it in place. (see Fig. 3)
Connect the black wire to any clean, unpainted metal surface on the engine (it is
important that this is a good electrical connection).
CHT Sensor Installation
Our standard CHT sensor is for air cooled engines only. For temperatures
consistently above 450˚F we have a thermocouple type sensor.
Remove the spark plug from the cylinder you wish to monitor and discard the
plug washer. (see Fig. 2) Check the surface of the head around the spark plug hole
for a smooth, flat finish to assure a good seal when the sensor is installed.
Position the sensor over the spark plug hole and check that you have sufficient
clearance around the outside of the sensor body to avoid damage when the plug
is installed and tightened. This may require some minor machining on some
installations.

Fig. 3
Proper
installation of
EGT sensor
13
Route the sensor cable from the motor to the pigtail with the grey boot on the
back of the instrument. Secure the cable with cable ties to prevent excessive
movement. The thermocouple cable is brittle and will break at the flex points
if not properly tied down. It is also good practice to protect the cable with
fuel line.
Beacon Receiver Placement (Optional)
The Digatron beacon receiver is used in conjunction with the Digatron transmitter.
The beacon receiver needs to be mounted on your vehicle with an unobstructed
view of the transmitter. Mount it with the red lens facing where the transmitter
is located, with the longest part of the case protecting the red lens from the sun.
Other racers will rarely interfere with the beacon signal, but mounting the receiver
as high as practical will help to avoid that situation.
Attach the receiver to your vehicle with cable ties or hook and loop material (such
as Velcro). Route the sensor cable to the pigtail with the white boot on the back
of the instrument.
Using A Beacon Transmitter (Optional)
When using Digatron SMART beacons, multiple beacons can be on the track at
once. Each SMART beacon can transmit one of 16 different signals. Your
instrument treats all of these signals as lap signals. When the instrument encounters
a beacon signal, it starts recording the race or it stops recording the current lap
and begins a new one. The instrument does allow you to ignore beacon signals
for a set amount of time after receiving a signal.
For more information about ignoring multiple beacons see Appendix B.

14
Here is a list of items to be aware of when using a beacon transmitter:
• Make sure the beacon receiver is mounted on the vehicle so that the signal has 
a clear path to the receiver.
• Direct sunlight into the receiver can cause a lap to not register. Install the
receiver with the overhang on top. If the rising or setting sun is pointed directly
into the receiver, set the transmitter on high power.
• Have the beacon transmitter on standard power if it is within 10' to 25' of the
receiving instrument. Set the beacon on high power if it is over 25' from the
receiving instrument.
• Beacons transmit their signal in a cone shape. If you are too close to the beacon
you may miss the signal or intermittently pick it up. The faster the kart, the
farther from the beacon transmitter signal it should be.
Manual Lap Switch Placement (Optional)
The Lap switch is used in place of the infrared beacon receiver. It should be
mounted to the steering wheel within thumbs reach of the driver. This switch
requires a 15/32" mounting hole for installation. Mount the switch in a position
that will provide easy access while driving.Tie the coil cord to the steering column
where needed to prevent it from interfering with the driver.
Route the sensor cable to the pigtail with the white boot on the back of the
instrument.
If the Lap switch is not used, leave it’s input connector open. Do not use a shorting
plug.
The DT-40K uses One AAA Battery (not included)
The DT-40K can run, without a backlight, for 200 hours on one AAA battery.
When using the backlight, one battery will power the instrument for 50 hours.
With the front of the instrument facing you, remove the left end cap. Remove the
battery from the holder. Observe polarity when replacing the battery. Replace the
end cap.
Steering Wheel Mount
Attach the three slotted holes on the large side of the mount to the bolts on the
center of your steering wheel. Place the nuts on the back of the instrument through
the two holes on the other side of the mount. Slide the instrument firmly to the
side to lock it in place. Adjust the nuts on the instrument for a tight fit.

15
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APPENDIX B: Setting Limits
Limits should be set at levels that allow you to react to the visual warning before
engine damage occurs.
• Enter Set Limits: To enter Set Limits press . The display should now be
flashing. 
• Change Number:To change the number being displayed press the or the
button. Hold either of these buttons down and the number will change
faster. 
• Next Limit: When you are finished setting the first limit, press the Function
button to set the next limit. Repeat the above procedure to set the remaining
limits, Tach calibration number and minimum lap time. 
• Save Limits:To save the current limits and return to Monitor/Record mode,
press the Exit/Power button.
Note: Set limits at levels high enough for normal operation, but not so high that
engine damage can occur before you can respond to a problem.
Limits can only be set for the functions your gauge is designed to monitor. If your
gauge monitors all three possible functions, the limits are set in the following
order: CHT/WT, EGT, Tach and Tach calibration number and minimum lap time.
If you do not have all of these functions, it will also set limits in this order, minus
the function(s) you are missing.
Tach
Tach requires two separate parameters. The first is the maximum revolutions per
minute (RPM) for safe engine operation. The second number is for Tach calibration.
In order to display the correct RPM for different engine types, the instrument
divides the Tach input signal by the Tach calibration number. This number can
be between .5 and 31.
The most frequently used Tach calibration numbers are:
1 - for single cylinder 2 cycle and most 4 cycle motors
2 - for 2 cylinder 2 cycle and 4 cylinder 4 cycle motors
If you are unsure of the exact Tach calibration number for your engine, experiment.
If your calibration number is currently set at 1 and the RPM displayed is double
what it should be, set the calibration number to 2. Alternately, if the RPM displayed
is half of the correct value, decrease the calibration number to half the current
number.
The Tach displays RPM in thousands of RPM. For example, if your display shows
9.50, your RPM is 9500.

16
Cylinder Head Temperature
Cylinder head temperatures (CHT) usually run in the 300˚F to 475˚F range. The
best way to determine the correct temperature for your particular motor is to tune
for proper plug or piston color and then observe what the head temperature is for
various throttle settings and atmospheric conditions.
Temperatures consistently over 450˚F will damage the standard CHT sensor. If
your motor frequently runs at cylinder head temperatures over 450˚F, your
instrument should have an exhaust gas temperature function, which can use a
thermocouple CHT sensor. This sensor can be used without damage at higher
temperatures, but it is not as accurate as our standard CHT sensor.
Exhaust Gas Temperature
Exhaust gas temperature (EGT) is used primarily for adjusting the air/fuel ratio.
Because of its quick response, the effects of carburetor adjustments are seen
immediately. Fuel system and carburetor problems can often be spotted quickly
enough to prevent engine damage.
Exhaust gas temperatures typically run between 1100˚F and 1350˚F. The EGT on
a properly tuned engine will increase rapidly as the throttle is opened and as the
load on the engine is increased.At full throttle and full load the EGT will stabilize
at a temperature dependent on the air/fuel ratio. Both a “too lean” or a “too rich”
condition will be indicated by a lower than peak temperature. The “too lean”
condition can damage your engine.An increase in coolant temperature or cylinder
head temperature is usually an indication of this.The best way to determine what
temperature is normal for your motor is to tune for good plug or piston color and
then observe the temperature at various throttle settings.
Ignoring Multiple Beacons (Minimum Lap Time)
Setting a minimum lap time allows the instrument to ignore multiple beacons on
a track. After the minimum lap time has passed, the next beacon signal received
will trigger a new lap in the memory of the instrument. Minimum lap time is the
last number set in Set Limits. This is the time, in seconds, that the instrument will
ignore beacon signals after receiving a signal. Make sure this number is less time
than it takes to complete a lap, otherwise your instrument will record inaccurate
lap times.

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5
4
3
8
2
1
7
6
APPENDIX C: Button Functions
1. Set Limits: Decreases the value of the limit being set. Hold this
button down for the number to change faster. Pg. 15
Monitor/Record: Toggles the backlight on and off. Pg. 5 
Laps: Finds previous lap’s data. Pg. 8
Playback: Causes the data to be played in reverse
direction, while data is being played back. If playback is paused,
this button will step through data in 0.1 second intervals, in
reverse direction. Pg. 9
2. Set Limits: Button not used.
Monitor/Record: Instrument enters Lap/Max and displays
Lap #. Pg. 8
Laps: Instrument enters Playback and begins reviewing data for 
the selected lap. Pg. 9
Playback: Pauses and resumes playback. Pg. 9
3. Set Limits: Increases the value of the limit being set. Hold this
button down for the number to change faster. Pg. 5
Monitor/Record: Instrument enters Set Limits. Pg. 15
Laps: Finds next lap’s data. Pg. 8
Playback: Causes the data to be played in forward
direction, while data is being played back. If playback is paused,
this button will step through data in 0.1 second intervals, in
forward direction. Pg. 9

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4. Powers on the instrument. Pg. 4
Set Limits: Press this button to exit Set Limits and return to
Monitor/Record. Pg. 15
Monitor/Record: Powers off the instrument or stops recording
data. It will only turn off the instrument if it is not recording 
and not receiving aTach signal. Pg. 5, 9
Laps: Exits Lap/Max and returns the instrument to
Monitor/Record mode. Pg. 8
Playback: Exits Playback and returns the instrument to
Lap/Max. Pg. 9
5. Set Limits: Changes the function being displayed in this order:
CHT/WT, EGT, Tach, Tach calibration number and minimum
Lap time. Pg. 15
Monitor/Record: Changes the function being displayed in this
order: CHT/WT, EGT, Tach, Lap # and Lap Time. Pg. 5
Laps: Displays the maximum value of each function, lap
number or total lap time for the currently selected lap. Displayed
in this order: CHT/WT, EGT, Tach, Lap # and Lap Time. Pg. 8
Playback: Changes the function playing back in this
order: CHT/WT, EGT, Tach, Lap #, and Lap Time. Pg. 9
6. Set Limits: Button not used.
Monitor/Record: Displays the maximum value for each engine
function since the instrument was turned on. If the instrument
is displaying Lap # and you press the Max/Event button, it will
display the current Event number. Pg. 5
Laps: Displays Event number if Lap # is being displayed.
(The display will show E and two numbers.) pg. 15
Playback: Displays the maximum reading for each
function for the current lap, the current Event number or the
total Lap Time for the current lap. Pg. 9
7. Press this button combination to clear memory, Lap # and
Event #. Press them until the display shows PrS PLA, then press
the Play/Pause button Pg. 7
8. Toggles between high and low resolution of time display.
High =  1:59.9 max. time displayed for this resolution. 
(minutes : seconds . tenths of seconds)
Low =  19:59 max. time displayed for this resolution.
(minutes : seconds) Pg. 7
9. Lap Switch Monitor/Record: Starts and stops the recording of a lap. Pg 14