Tach problem

slick59

Registered User
I did a search and some reading but there was no solution posted. The tach in my 90 is intermittent. Sometimes it works good, then it will just drop to zero may or may not come back. sometimes it looks like its trying to come back and tries to creep up to 500 or so. No check engine light no codes. is there gears in the tach? I have never had one of these clusters apart.
 
Only time mine acts up is when either the IGN circuit was shorting or the CAM sensor connector is lose.
 
>I did a search and some reading but there was no solution posted.

That's strange since it seems like this comes up at least once a week :)

Erratic tach indicates loss of tach signal, which is cam sensor, harness, grounds or all.

Check codes for hints.
 
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