Dakota Digital ECD-100 User manual

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ECD-100
ELECTRONIC CABLE DRIVE
The Dakota Digital ECD-100 is designed operate a cable-driven speedometer from a
transmission or ECM electric speed signal. Cables are available for GM thread-on (5/8” thread), GM
clip-on, or Ford clip-on. The supplied cable threads on to one end of the ECD-100 and the wiring
harness exits on the other end. Do not use the vehicle’s original speedometer cable; use the one
supplied with the ECD-100. The module is fully sealed and can be mounted under the dash or in the
engine compartment. The module should not be mounted under the vehicle due to the danger of
road debris causing damage. The unit is fully adjustable from the comfort of your driver’s seat.
GM 5/8” thread GM clip-on Ford clip-on
ECD-100 wiring connections:
RED – 12V power with key on.
BLACK – Ground.
WHITE – Vehicle speed signal.
GREEN – Input for setup switch. (grounding to activate)
For 2-wire transmission speed sensors that are not connected to anything else, the polarity of
the wires does not matter. Connect one wire to the WHITE wire on the ECD-100 and the other to the
same ground point as the BLACK wire on the ECD-100. Twisting the ground and signal wires around
each other provides an additional level of interference protection. The speed signal wire should not
be routed alongside tach, ignition, or other high current or high voltage wires.
For vehicles which have a vehicle speed signal from a transmission controller or ECM, tap into
the VSS wire and connect it to the WHITE wire on the ECD-100. Consult a vehicle service manual or
wiring diagram to determine wire color and location.

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Speedometer calibration:
To operate the setup procedure, the green wire needs to touch ground.
The green wire can be wired to one side of the enclosed push button switch, and the other side of the
switch goes to any ground. The switch should be mounted in the car, with easy driver access.
The LED’s on the ECD-100 will indicate the setup mode, and the ECD-100 will also move the
speedometer needle to different positions during the setup, without having to see the control unit.
The three setup mode indicators are: 30 MPH for AutoCal / 20 MPH for Adjust / 45 for Preset.
The needle position may not point exactly on the stated speedometer number, but will be close.
Entering setup:
•Press and hold the switch, then start the engine.
•The speedometer needle will move up to about 15 MPH (24 km/h), (the RED light will be on
steady).
•Release the switch, after the engine is running.
•The needle should move up to about 30 MPH (48 km/h) for AutoCal.
•You may press and release button to move the needle to: 20 for Adjust, 45 for Preset, or back
to 30.
AutoCal (30 MPH):
•Needle should be pointing to 30 MPH (48 km/h).
•Press, and hold, the switch until the needle drops to 0 MPH.
•Release the switch.
•The needle will move up to about 10 MPH (16 km/h).
•Begin driving a marked mile.
•The needle will move up to about 30 MPH while it is receiving a speed signal, and will drop to
about 10 MPH when no signal is present.
•Press and hold switch as you “cross finish line”, or stop at the end of the mile, until the speed
drops to 0 MPH.
•Release the switch and the unit will begin normal operation.
Adjust (20 MPH):
•Needle should be pointing to 20 MPH (32 km/h).
•Press and hold the switch until the needle drops to 0 MPH.
•Release the switch.
•The needle will now operate normally as you drive.
•Drive at a constant speed, follow another vehicle, use a GPS, or use some other method to
verify your actual speed.
•Each time you press and hold the switch the speed reading will begin changing.
Release the switch and press it again to move in the opposite direction.
•When no changes have been made for 10 seconds, the new calibration will be saved, and the
unit will resume normal operation.

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Preset (45 MPH):
•Needle should be pointing to 45 MPH (72 km/h).
•Press and hold the switch until the needle drops to 0 MPH.
•Release the switch.
•The table below shows the pulse per mile (PPM) presets available.
•Press and release the switch to change the selection press and hold to save.
o10 MPH = 4000 ppm
o20 MPH = 8000 ppm
o30 MPH = 16000 ppm
o40 MPH = 64000 ppm
o50 MPH = 128000 ppm
o 0 MPH = factory preset
During normal operation, the RED light will be off and the GREEN light will be on steady when no
speed signal is present and flashing when a speed signal is being received.
If the RED light is flashing rapidly, then the cable is stuck and not able to turn. Some stock
speedometers may become very stiff at low temperatures (below freezing) and not allow the cable to
turn. Make sure your stock speedometer is in good working condition.
Trouble shooting guide
Problem Possible Cause Solution _
Speedometer will not work. No power to ECD-100. Check the power and ground wires
GREEN and RED lights off. on the ECD-100.
It should be 11-15 V dc.
Speedometer will not work. ECD-100 is in setup mode. The green wire should be disconnected
RED light on steady. Green wire is grounded. for normal operation.
Speedometer will not work. ECD-100 cable is not Check the cable for kinks and verify
RED light flashing rapidly turning. the speedometer turns freely.
and GREEN light on steady.
Speedometer will not work. No input signal. Test for 1-20 volts AC at the white
GREEN light on steady. wire with the wheels spinning.
Grounding interference. Make sure both the speed sensor and
ECD-100 are grounded at the same
location.
Speedometer will not work. Speedometer is not Check speedometer cable connections
GREEN light flashing. connected. at both ends.
Speedometer is damaged. Repair or replace speedometer.
Speedometer will read Tach wire too close to Route the speed signal and tachometer
when the vehicle is speed signal wire. wires away from each other to avoid
sitting still. interference.
Ground interference. Make sure the speed sensor and
ECD-100 are grounded together.
At the end of AutoCal the Speed signal is too low or Check speed sensor is operating
speedometer needle goes too high. correctly.
to 45 MPH. Distance driven is too short Make sure the distance driven is one
or too long. mile.

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SERVICE AND REPAIR
DAKOTA DIGITAL offers complete service and repair of its product line. In addition, technical
consultation is available to help you work through any questions or problems you may be having installing one
of our products. Please read through the Troubleshooting Guide. There, you will find the solution to most
problems.
Should you ever need to send the unit back for repairs, please call our technical support line, (605)
332-6513, to request a Return Merchandise Authorization number. Package the product in a good quality
box along with plenty of packing material. Ship the product by UPS or insured Parcel Post. Be sure to include
the RMA number on the package, and include a complete description of the problem with RMA number, your
full name and address (street address preferred), and a telephone number where you can be reached during
the day. Any returns for warranty work must include a copy of the dated sales receipt from your place of
purchase. Send no money. We will bill you after repair.
Dakota Digital 24 Month Warranty
DAKOTA DIGITAL warrants to the ORIGINAL PURCHASER of this product that should it, under normal use and
condition, be proven defective in material or workmanship within 24 MONTHS FROM THE DATE OF PURCHASE, such
defect(s) will be repaired or replaced at Dakota Digital’s option.
This warranty does not cover nor extend to damage to the vehicle’s systems, and does not cover removal or
reinstallation of the product. This Warranty does not apply to any product or part thereof which in the opinion of the
Company has been damaged through alteration, improper installation, mishandling, misuse, neglect, or accident.
This Warranty is in lieu of all other expressed warranties or liabilities. Any implied warranties, including any
implied warranty of merchantability, shall be limited to the duration of this written warranty. Any action for breach of any
warranty hereunder, including any implied warranty of merchantability, must be brought within a period of 24 months from
date of original purchase. No person or representative is authorized to assume, for Dakota Digital, any liability other than
expressed herein in connection with the sale of this product.