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Old 06-21-2011, 01:10 AM   #1
WB72
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Camaro Tach conversion Fail

For about 2 years now, I have been wanting to put a Camaro Tach in my stock cluster. Well I worked on it last week and there is no movement in the tach, even though it looks good and close to the stock look, if it doesnt work, it was a waste of time and $.

Is there a way to check a 1980 Camaro tach, or any one for that matter, to see if it is working?

I have checked the wiring, it is correct, I have a 12V power wire, a ground (to the case of the gauge cluster, and a wire direct to the ground of the vehicle), and a wire that goes to the tach output of my HEI Distributor.

I know something is not functioning properly, it is either the tach or the output from the Distributor.

How can I check these items? Could it bae something else?
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Old 06-21-2011, 08:54 AM   #2
Longhorn Man
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Re: Camaro Tach conversion Fail

it needs a power source
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Old 06-21-2011, 10:24 AM   #3
WB72
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Re: Camaro Tach conversion Fail

I do have a power source that is on while the ignition is on. Does it have to be powered all the time?
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Old 06-22-2011, 11:44 PM   #4
Longhorn Man
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Re: Camaro Tach conversion Fail

sorry... I missed that all together.
My bad
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Old 06-23-2011, 12:28 AM   #5
jbclassix
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Re: Camaro Tach conversion Fail

was it a v8 tach? You may want to try connecting a known good tach and see if it works. If you have a good enough DVOM that can measure pulse width, but the known good tach is always a sure-fire route. Are you using the single wire off the HEI? Got any pics? Pics may help in troubleshooting. Just a warning, tachs and speedos that use a pulse width DO NOT LIKE TO BE JUMPED FOR TESTING!
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Old 06-23-2011, 12:57 AM   #6
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Smile Re: Camaro Tach conversion Fail

Just curious, when you applied 12V positive to the correct location on the tach, did the needle go to zero?
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