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Discussion Starter #1
my tach runs up to 4k at the turn of the key to "run", no starter yet, engine not running. Once running tach rolls up to 8k and stays there as long as engine is running. When engine is turned off, back to 0. It has done this since I bought it. I've added a Pertronix ignition and a 4 barrel carb setup which has improved driveability, but did not affect tach issue. Any ideas?
 

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I think there’s a site called zgarage with info on adding a resistor to the back of the tach. Or if you have a 280 tach you could swap the faceplates and use it. That’s what I did.
 

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thanks for the info. I'm pretty sure I have a 280 tach laying around, the next time I get ambitious it may find its way in there. Right now there's a exhaust smell that's driving me crazy. Always something with old cars. Thanks again.
 
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