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Old 11-10-2012, 04:28 PM   #1 (permalink)
 
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Bouncing tach

Fired up my 71 lemans for the first time. Had to cut it short due to a bad coolant leak.
The issue is the tachometer isn't reading steady. It'll try and read correctly but bounces around and drops to zero for a bit.
I have the crane cams xr-I conversion installed without the ballast. I also don't have the tach's lighting wire hooked up.
Any one have ideas why it's doing this?
Good news is it fired up easy once it had gas.


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Old 11-10-2012, 04:42 PM   #2 (permalink)
 
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Are you using an original tach with an HEI distributor?
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Old 11-10-2012, 05:28 PM   #3 (permalink)
 
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It's a repro tach. Points distributor with the crane cam xr-i electronic conversion


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Old 11-11-2012, 06:53 PM   #4 (permalink)
 
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I know the original tachs won't work properly with the GM HEI distributors, but i can't help you woth your combination.

Any chance you can get answers from the company that supplied the tach? Sounds like it doesn't like the signal from the crane unit...
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Old 11-11-2012, 10:45 PM   #5 (permalink)
 
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I read something on needing to put resistors in the tach wire somehow.



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