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65 Chevyii tach hookup

Discussion in 'The Hokey Ass Message Board' started by ChevyIIman65, Jun 26, 2018.

  1. ChevyIIman65
    Joined: Jun 17, 2018
    Posts: 36

    ChevyIIman65

    Hey yall i have a Autogage tach in my 65 Chevyii with inline 6 cylinder with the original points distributor and it runs fine and revs fine but according to the tach it revs high at like 3.000 but sounds like its really revving at 5.000 not sure if i hooked it up right or not can i please get some help if i shift at 3.000 it sounds like its screamin but i have my wire on the negative on the coil 1530038828755.jpeg 20180626_144725_HDR.jpeg

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    Deuces likes this.
  2. Is it a six cylinder tach?


    Phil
     
  3. squirrel
    Joined: Sep 23, 2004
    Posts: 56,074

    squirrel
    Member

    Did you calibrate it for 6 cylinder use?
     
  4. ChevyIIman65
    Joined: Jun 17, 2018
    Posts: 36

    ChevyIIman65

    I have no idea theres no switch to switch between 6 and 8 i thought it woukd jist work but im gonna swap a v8 in hopefully this summer anyways

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  5. squirrel
    Joined: Sep 23, 2004
    Posts: 56,074

    squirrel
    Member

    the older Autometer tachs have two wire loops, where the rest of the wires come out. You cut one or both of them for 6 or 4 cylinder use. Figure out what wires it has, look up the instructions on the internet, and see if you can get it to work.
     
  6. ChevyIIman65
    Joined: Jun 17, 2018
    Posts: 36

    ChevyIIman65

    Nothing on the internet says anything about it just to connect the tach wire to positive side of coil or on connector on hei

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  7. 41rodderz
    Joined: Sep 27, 2010
    Posts: 6,541

    41rodderz
    Member
    from Oregon

    Did you go to their web site ? Looks like they have downloads and videos. Call them . I think an more age looking appropriate tach would look cool with your patina dash.
     
  8. I thought tach usually connected to negative side of coil?

    Phil
     
    Rich S. likes this.
  9. Rich S.
    Joined: Jul 22, 2016
    Posts: 296

    Rich S.

  10. squirrel
    Joined: Sep 23, 2004
    Posts: 56,074

    squirrel
    Member

    Did you find the model number of the tach you have, and download the instructions for it?

    Tach wire goes to negative side of coil, as you have it wired now. But the instructions will tell you how to set the tach for 4, 6, or 8 cylinder use.

    edit: see the above instructions? the next two pages in the pdf file explain how to program it for the number of cylinders, set the shift light, etc.

    tach01.jpg
     
  11. Gerrys
    Joined: May 1, 2009
    Posts: 326

    Gerrys
    Member

  12. squirrel
    Joined: Sep 23, 2004
    Posts: 56,074

    squirrel
    Member

    ...but find the model number of YOUR tach, and get the instructions for it! not the one shown above.
     
    Rich S. and 54vicky like this.

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