Installed new coil, now the tach acts funny

4spdragtop said

Or you could have buggered the tach? Hopefully not. Borrow another known good tach and try it with stock coil.

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Luckily I still have another tach I’d been using with no problems, I’ll try that.

Out of curiosity, what could screw a tach like that? All I did was hook it up