ok, here is the problem, buring my motor rebuild, my tach went out... i dont know if it happened while the motor was being rebuilt or not because my car was sitting for about 6 months. after he is done, i go to pick it up and my tach doesnt work. he tries to fix it and when we hooked up a voltage meter to the diagnostic port, it would give us some movement when we pressed the gas. all of my other guages work except this one. i bought another whole cluster and installed it.... STILL NOTHING!

please help..... i am trying to use the wiring diagram to check where the wires go but cant figure out how to read it.... its on page z-44 if anyone has it!

thanks!!!!

 

the ecu uses pin 2B to drive the tach. thank little rotor

 

...that's also the same connection you tested in the IG terminal of the data link port. See the bottom left of Z-30.

Not that that helps yet.

First be sure the datalink port IG terminal give some rpm measurement on a meter (...with rpm/frequency measurement).

You'll have to trace it down. Check continuity between the IG port (or ecu 2b like mad_7tist said) and the Y/L (yellow w/ blue stripe) on the cluster connector.

 

i belive if the trailing coil goes bad, or isint plugged in the tach wont work, so put a timing light on all the wires and check em one at a time, see if its working