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Thread: Tach Help

  1. #1
    Registered thespy's Avatar
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    Pompano Beach, FL , USA

    Tach Help

    I just replaced my orig Stewart Warner Tach with a new Gaffrig GL6000W. I think that the rpm's shown are not the same as my old tach, off about 600 rpm. When I installed the tach I reviewed the factory settings, which from the instructions seemed to be set for 8cyl.

    I want to recheck these switch positions, does anyone know what they should be for a 420 merc ? I was cleaning up and threw out the instructions.

  2. #2
    Were doomed! Charter Member Wally's Avatar
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    Chris Craft Stinger 222
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    there should be a sticker on the side of the tach telling you what to setup the switches for.
    Also another tid-bit.....some tachs, depending on how old that one is, need a small resistor board because of interfearence from electrical acc. You can call Gaffrig and ask for one.
    The new ones should be all ok though.

    Money can't buy happiness, but it can buy horsepower. And I've never seen a sad person hauling a$$!

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