Tachometer does not operate at all
Before proceeding check the following:
Turn on the key. Pointer may "jump" it may or may not be exactly on zero. If not:
Check for power on the IGN terminal
Ground on the GND signal
Signal on the SIG terminal
Turn on the lights, if the lights do not work, there is not a ground,.
Check that the signal selection switch is on the proper setting and the position is in the detent firmly selecting the cylinder.
Gas vehicle cylinder selection
#1 4 cylinder also used on GM LS engines (use 10K-ohm pull up resistor per booklet one side to signal, one side to 12V power)
#2 6 cylinder
#3 8 cylinder
Once the above is checked, the following can be done to check for proper tachometer operation:
Turn on the key, using a small flat blade screwdriver, move the cylinder selection switch to a position BETWEEN two positions. This will disengage the internal circuitry and the pointer will climb.
Gauge climbs:
Tachometer is operational, check signal source or wire from source for continuity
Gauge does not climb:
Tach is faulty, call NVU customer service at 248-850-5482 with code:ACT144