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Old 09-28-1999, 10:37 PM
Benzmac Benzmac is offline
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Join Date: Mar 1999
Location: Suwanee, GA, USA
Posts: 4,712
If it was by any chance an 85 built in late 84, it might have an overvoltage relay behind the glovebox mounted to the right hand wall of the car.

It could be the diagnostic socket is faulty. Look on the L/F fender undere the hood there will be a small black round cyl. That is the control unit that outputs to the tach.

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