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  1. #1
    richard cruthis's Avatar
    richard cruthis Guest

    Default i have an old house boat. it h

    i have an old house boat. it has the old 270 hp 350 mercruiser w/outdrive. wanting to put in an rpm guage in the upper station. i found out that it takes a special tach for the old thunderbolt 1 ignition. the tach uses a negetive pulse. all other tachs that i can find use a positive pulse. is there anyone out there that has a suggestion or may have an old tach that would work that they may want to sell?

  2. #2
    Join Date
    Jul 2006
    Location
    Anderson, South Carolina,
    Posts
    22

    Default "Richard, Every Tach I'

    "Richard,

    Every Tach I've ever seen is triggered by the negative pole on the coil. Someone correct me if I am mistaken.

    follow link, see diagram and description

    http://www.teleflexmarine.com/cgi-bi...amp;link2=1050"

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