LongacreRacing.com LIT-5241 REV A
Longacre Racing Products
977 Hyrock Blvd.
Boonville, IN 47601
800-423-3110
ACCUTECH DLI TACH
SETUP FUNCTIONS
If you are running an 8 cylinder motor and are OK with an 8000 RPM warning light
setting you do not need to go thru the setup process.
All functions are controled by the Recall-Select button (moves to the next mode) on the left and the Reset-Adjust button (adjusts
settings) on the right. This often involves going back and forth between the two but setup is easy and only needs to be done once.
Settings are saved automatically after not pushing either button for 20 seconds. If you want to keep the current setting push Select
(left button) to continue on to the next mode.
There are 2 sets of high RPM warning lights:
On the left side of the tach are 6 LEDs that come on sequentially. These can be used for pit road speed indication at lower RPM or a
sequential shift light at high RPM. You set the highest RPM at which all 6 LEDs are on. They begin to come on - one at a time until
all 6 are on - at 500 RPM below your setpoint, to give you warning. Can be set at any RPM.
On the right side is a larger single Red LED. This is intended to be a high RPM warning light or a shift light. It has 2 settings. At the
first setting the LED comes on steady. At the second setting it flashes rapidly to agressively attract your attention. This can also be
set at any RPM you need.
If you prefer not to use either of these warning light systems set them at a high enough RPM so that they will never come on.
However we strongly urge you to use at least the high RPM warning to help prevent over-reving expensive motors.
THIS TACH AND THE WARNING LIGHTS ARE NOT AN RPM LIMITER.
To get into setup mode hold both buttons for 5 seconds:
Pit Road Speed is the first selection. Each digit is set separately (digits to be set flash). Use Adjust (Right button) to change. When
you have what you want push Select (Left button) to move on to the next digit. Adjust the same way. (Remember that the setpoint
you are establishing is the point where all 6 LEDs are on.) You can set this in l00 RPM increments. Default setting is 9000 so you will
need to reset it if you want to use this feature. If this is all you are setting when you are done simply stop pushing buttons. After 20
seconds the tach will automatically save your changes and revert to normal function. If you wish to change other settings push the
Select (Left button) again and you will go into the next mode - setting the large Red LED.
Set Red LED warning light: After you have finished setting pit road speed above push Select (Left button). The first setting is LED
on steady (default setting 8000). Set as above using Adjust (Right button). When you have the setting you want push Select (left
button) again to move on to the LED flashing setpoint (default setting 8500). Again set as above. If you are done, stop pushing
buttons and the tach will revert to normal function in 20 seconds. If you need to change the number of cylinders push Select (left
button) again.
Set number of cylinders for your motor: This last mode comes after you are done setting the Red LED. The numbers shown
represent the number of times the ignition system fires per revolution. Options are:
0.5 for 1 cylinder
1.0 for 2 cylinder (use this for I cylinder 2 cycle motors)
1.5 for 3 cylinder
2.0 for 4 cylinder (use this for 2 cylinder 2 cycle motors)
2.5 for 5 cylinder
3.0 for 6 cylinder (use this for 3 cylinder 2 cycle motors)
4.0 for 8 cylinder (this is the standard/default setting on new tachs)
5.0 for 10 cylinder
6.0 for 12 cylinder
The backlight on this tach is white and is not adjustable.
