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There is a 'cigarette butt' trick that can be done to fix that tach unit (the thing that looks liek a garbage can at the left front fender). Essentially, you jam something between the lid of the the unit and the actual connections inside the unit. Makes the connections actually work, which then allows the tach to work.
I didnt bother with that, just got a new one from fastlane and havent had any problems in 2 yrs/50k.
Another option could be a dirty/bad connection in the insrument cluster. Pop it out and check.
JMH
P.S. The cigarette butt trick was one of the first things that got discussed at length when I started watchin this board, at almost its beginnings. Look way back in the archives and youll find lots of info on it.
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