tachometer problem
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Elder User
Joined: Sep 2010
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From: Small acerage in Nebraska
tachometer problem
The tachometer in my '91 is off, I noticed it right after I started driving it several weeks ago. I verified it with an inductive tach. At 2000 rpm actual the dash tach reads 3000. I verified that the cluster is for an 8 cylinder, tried another tach unit from different cluster with same results. I baffled at the moment, need more input. Any ideas?
Lead Driver
Joined: Sep 2002
Posts: 9,182
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From: Gateway to the West
The tach signal is driven by the PIP sensor and ICM wiring at the distributor. I don't have my wiring reference here at work so I can't give you anything more specific than that at the moment.
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Elder User
Joined: Sep 2010
Posts: 667
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From: Small acerage in Nebraska
If you recall, I changed the ICM last month because of error code. No srvc engine light yet,but should check for continuos error codes, just because I can. There was no change in the tach function then till now, not elimanating it though.
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