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Old 06-01-2008, 05:04 PM
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72 chevelle ss dash tach wiring

Hi all
A friend of mine just converted his dash from the stock sweep style to the SS dash with a complete kit with harness and cluster and the tach does not work. power and grounds seem ok, the tach jumps a bit when the key is turned to on position. what I need to know is what color is the tach signal wire and also will this tach(stock GM) work with the tach output from an MSD box.


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Old 06-02-2008, 07:55 PM
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If the original cluster didnt have a tach there might not be a tach feed to th

If you have the pos and neg correct the tach should return to 0 when the key is switched on.

you may have to run a tach feed from your MSD box (or the cap on your HEI)

I went thru this same thing on my camaro when I converted to a Z28 cluster.......lots of changing pins in the connector, but only had to run 2 new wires.
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Old 06-03-2008, 01:21 PM
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You may also require a filter. MSD sells two different ones, and many GM cars with factory tachs used a factory filter in-line on the trigger circuit.

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Old 06-03-2008, 08:53 PM
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The color of the wire for your tach is a brown one. For more information on this subject go to www.chevelles.com and go to the electrical section. You'll find a lot of info there.
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