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  1. #1

    Default Aftermarket Tach - 1990 GMC 1500

    I'm trying to install a little 3" tachometer but I can't seem find the correct wire coming from the coil or distributor.
    I know my green wire off the tach is the "signal wire" but when I go searching for a green or brown wire under the hood I'm not finding it.

    1990 GMC C1500 \ 5.7L 350

    Here's a shot of the distr. and I'll get one of the coil tomorrow when the sun is out.
    Any help greatly appreciated.

    The distributor has a connector labeled ABCD on top, just FYI.
    Thank you.

  2. #2


    I believe the tach feed is the red wire coming off the distributor, If you follow the harness from the dist. toward the truck I think there's a connector inside that plastic crap that you splice it off. I have one on mine ill check it out tonight and try and get you a picture of my setup

  3. #3


    Excellent, I appreciate it. If you can get a picture that would be sweet otherwise just a for sure confirmation it's the red wire lead. Thank you!

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