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Author Topic: New Tach behaves the same as my original!  (Read 1777 times)

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Offline 75Esprit

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Re: New Tach behaves the same as my original!
« Reply #15 on: June 25, 2011, 09:24:11 PM »
Yes, I connected the Autometer to the harness that plugs into the factory tach. It worked great. I ran a jumper from the ground terminal on the factory tach to a body ground- no difference.
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Offline ta78w72

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Re: New Tach behaves the same as my original!
« Reply #16 on: June 26, 2011, 12:13:01 PM »
Either you have a bad tach, or something is screwy with the electronics on the plastic circuit.  Just to check, have you tried swapping another factory tach in that cluster?
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Offline 75Esprit

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Re: New Tach behaves the same as my original!
« Reply #17 on: June 26, 2011, 10:21:08 PM »
The tach only uses the ground from the circuit board. The tach signal and 12v comes from the plug in harness. I've removed the tach, run a new ground and plugged in the factory harness and got the same result.
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