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Author Topic: 4.2 L tach wiring.  (Read 1852 times)

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Offline bdron

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  • Posts: 369
4.2 L tach wiring.
« on: December 02, 2008, 05:37:38 PM »
I have a 1980 cj7 with a straight six 258. It originally had a 304 ci v8. I am trying to hook up a tach. from a 6 cylinder to the wiring harness from the 304 but it has a 3 wire connector and now I only need 2 wires.
 anyone have any ideas what I can do?
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Offline stroker sahara

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Re: 4.2 L tach wiring.
« Reply #1 on: December 02, 2008, 10:43:12 PM »
I would assume that the 2 wire harness grounded through the body of the tach, which leaves a switched 12V power source and a wire to the negative side of the coil, but I could be wrong.
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Offline bdron

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Re: 4.2 L tach wiring.
« Reply #2 on: December 13, 2008, 08:34:58 PM »
It is the factory cj 6 cylinder tach that I am putting in but the 2 wires from it are red and none of the old wires are red.
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