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1st Generation Specific 1979-1985 Discussion

anyone ever replace a tach?

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Old 07-15-2006, 11:46 AM
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well? car is a 79. ive seen a couple 83-84-85 tachs that dont work well when cold, this one reads about double what its supposed to. is it something else maybe?
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Old 07-15-2006, 12:04 PM
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Perhaps it's not effectively switching from volts to tach?
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Old 07-15-2006, 12:20 PM
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it could be, now the question is why would it do that?
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Old 07-15-2006, 02:30 PM
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You have an aftermarket to test it with?
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Old 07-15-2006, 03:12 PM
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Originally Posted by 1revnrex' post='828613' date='Jul 15 2006, 12:30 PM

You have an aftermarket to test it with?


nope only an oem
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Old 07-15-2006, 04:42 PM
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bleh, Id say pick up a cheap one from (insert random autoparts store here) and try it out. Then take it back and get a refund once you know the results.
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Old 07-16-2006, 11:18 PM
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did you pop the hood and make sure it doesn't have a v-8? It happens.
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Old 07-17-2006, 09:59 AM
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Originally Posted by setzep' post='828777' date='Jul 16 2006, 09:18 PM

did you pop the hood and make sure it doesn't have a v-8? It happens.


nope factory engine
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Old 07-18-2006, 02:56 AM
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Most autoparts stores here have a return policy on electronic parts. If it's 'installed', you can't return it for a refund.



Do you have a dwell/tach meter handy? Does the car still have points? Or has someone butchered in an FB electronic dizzy?
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Old 07-18-2006, 09:19 AM
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Originally Posted by Jeff20B' post='828953' date='Jul 18 2006, 12:56 AM

Most autoparts stores here have a return policy on electronic parts. If it's 'installed', you can't return it for a refund.



Do you have a dwell/tach meter handy? Does the car still have points? Or has someone butchered in an FB electronic dizzy?


its still got points, i put the dwell meter on it, and the dwell meter says 800rpms, engine sounds like 800 rpms, tach in the car is at 1600ish, we're thinking a diode or something went bad in the tach.
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