Question about 1991 GMC C1500

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Wiring a tachometer to the coil

I'm looking to find out what color wire to the coil do i tag for my tach.

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  • larry creason Jan 12, 2009

    thank you,can i scotch lock it at the coil?

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It should be a white or purple wire at the coil, or you can get it at the ecm plug on the passenger side of the firewall.

Posted on Jan 12, 2009

  • Josh Crager
    Josh Crager Jan 12, 2009

    you should solder it, scotch locks have the worst failure rate of any electrical connector.

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