This is on a 91 SI. It worked until today, then stopped. Anyone have a link to the electrical troubleshooting manual online?

 

check that the blue wire, on the distributor plug is not broken. i just found mine broken, after i noticed that my tach wasn't working! If that's not your problem, trace that same wire back to the instrument cluster. check for continuity in that wire, from the cluster to the distributor.

 

Your stock tack isn't working ?

Your options are swap a good cluster in see if it works.
When you do that you can check the Ohms on the blue wire to the distributor
I rememeber having intermediate problem once and it was a loose wire inside the distributor

good luck


[Modified by Camshaft, 6:33 PM 2/10/2003]

 

Yeah, the stock tach just stopped working Saturday. Should there be any resistance on the blue wire or do I just check for continuity?

 

steve, you should see the voltage reading increase as you rev the motor.