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Tach is fine. I swapped out the alternator & voltage regulator at the same time (mainly as I didn't want to do the labor twice, even if I was the one wrenching) which fixed it. I saw voltage spikes at the battery up to 16-18 volts when the tach would go crazy momentarily.
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1987 Venetian Blue (looks like grey) 930 Coupe
1990 Black 964 C2 Targa
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