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Tach problem

604 views 6 replies 2 participants last post by  145566 
#1 ·
So today i just replaced my idle air sensor and my tach did a 180 and goes backwards now. I've goggled everything to no avail can anyone help me out?
 

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#4 ·
I'm stumped too. The tach gets its signal from the coil. I'm not sure how one would, but you didn't happen to ground anything out (see any wires arc and spark) when you were putting the iac on did you? But I guess if you did then the tach wouldn't work at all. Could it be a coincidence that the little gear thing behind the gauge cluster that the tach needle sits on crapped the bed during the iac replacement? The back of the gauge cluster is a circuit board with little drive gear type things that spin the needles. I can't think of any way how the iac would make the tach spin in reverse.
All else fails I know a guy w an extra gauge cluster for a '95.

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