Logo
Results 1 to 2 of 2
  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"

Similar Threads

  1. Mercruiser 5.7L Thunderbolt Ignition/Coil
    By Delta8500 in forum Mercruiser Sterndrive Forum
    Replies: 1
    Last Post: 08-01-2010, 09:07 AM
  2. Mercruiser ignition identification thunderbolt
    By willxfs in forum Mercruiser Sterndrive Forum
    Replies: 36
    Last Post: 06-05-2010, 10:07 AM
  3. Thunderbolt iv ignition
    By redsnapper386 in forum Mercruiser Sterndrive Archive
    Replies: 4
    Last Post: 06-06-2009, 11:33 PM
  4. Thunderbolt V ignition
    By fonseca_air_210 in forum Mercruiser Sterndrive Archive
    Replies: 19
    Last Post: 02-11-2009, 07:14 PM
  5. Mercruiser Thunderbolt IV Timming Pre ignition
    By Dean Schreiner in forum Mercruiser Sterndrive Archive
    Replies: 13
    Last Post: 05-07-2007, 05:24 PM

Posting Permissions

  • You may not post new threads
  • You may not post replies
  • You may not post attachments
  • You may not edit your posts
  •