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Thread: Tach Help

  1. #1
    Registered thespy's Avatar
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    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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    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.
    -Wally


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