Quote:
Originally Posted by Zacharias
The tach on the 1985 is controlled through the EGR mini-computer, which in turn runs through an overvoltage protection relay (aka OVP), which in turn has a spade fuse (10A I believe, not certain).
Chances are either the fuse has blown or the relay is faulty.
Had you done any electrical work on the car in the last few days? (I blew mine when we installed a new alternator.)
The OVP is on the passenger side kick panel area. You will need to remove the large trim panel under the glove box to get to it. It's about 2.5x the height of one of the generic 'ice cube' relays and the fuse is on top.
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Just wanted to let you all know that the cause of my tach suddenly not working was indeed the OVP relay. I swapped one from my 85 wagon into the coupe and the tach worked. Thank you Zacharias, and the rest of you, for your kind assistance.
Best,