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    Crazy Tachs-gctid816904

    I just installed electronic ignitions on both motors of my 3218. The boat runs fantastic but the tachs will hover at or near 5000 rpm and then bury the needles way beyond the high side.

    They will however work together from idle to 5000 rpm before they start to get jumpy. Back when I had the points both tachs seemed to work well.

    Both sets of tachs on the flybridge and lower helm all go nuts at high rpms.

    Any thoughts?
    Dan
    Frostbite Falls, Minnesota
    Claudia V. III
    1988 - 3218
    Gas Drives

    #2
    I forgot to add that these are the old original analog tachs
    Dan
    Frostbite Falls, Minnesota
    Claudia V. III
    1988 - 3218
    Gas Drives

    Comment


      #3
      Just had this issue on a car I restored. Installed a diode in line to the tach and the issue is gone.

      I just looked up these articles that might help?

      http://documents.msdperformance.com/8910.pdf

      http://www.hot-spark.com/tachometer-fix.pdf

      Comment


        #4
        I appreciate the info. Just what I was looking for...thank you
        Dan
        Frostbite Falls, Minnesota
        Claudia V. III
        1988 - 3218
        Gas Drives

        Comment

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