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Technical Old Dixco tach

Discussion in 'Traditional Hot Rods' started by Mike Colemire, Jun 18, 2019.

  1. Mike Colemire
    Joined: May 18, 2013
    Posts: 858

    Mike Colemire
    Member

    Just got my A sedan started and at an idle, I'd say around a 1000 rpm at the time, my tach is reading 3000. Is there a way to change these from 4,6, and 8 cyl? I'm thinking that's the problem but it's been so long since I fooled with one I can't remember.
     
  2. If I remember correctly, Dixco tachs had resisters on the back. You removed one or both to set the number of cylinders.
     
  3. Mike Colemire
    Joined: May 18, 2013
    Posts: 858

    Mike Colemire
    Member

    That don't sound good.
     
  4. Mike Colemire
    Joined: May 18, 2013
    Posts: 858

    Mike Colemire
    Member

    Finally found an old Hamb thread by googling it about 4 different ways. They are suppose to have 3 resistors, red, blue and brown for a V8, 6 cyl you remove the red one. My question is if I'm missing one where in the world would I find resistors?
     
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  5. saltracer219
    Joined: Sep 23, 2006
    Posts: 615

    saltracer219
    Member

    Radio Shack
     
  6. Mike Colemire
    Joined: May 18, 2013
    Posts: 858

    Mike Colemire
    Member

    Never thought of that, thanks.
     
  7. Seepwater
    Joined: Aug 13, 2006
    Posts: 158

    Seepwater
    Member

    You might have a job ahead of you trying to find a Radio Shack....most of them went under some years ago!
     
  8. Gman0046
    Joined: Jul 24, 2005
    Posts: 5,410

    Gman0046
    Member

    The biggest problem is determining the resistors value if its missing.
     
    lothiandon1940 likes this.
  9. 41rodderz
    Joined: Sep 27, 2010
    Posts: 2,264

    41rodderz
    Member
    from Oregon

    Radio Shack went out of business last year here.
     
    lothiandon1940 and lumpy 63 like this.
  10. tubman
    Joined: May 16, 2007
    Posts: 4,042

    tubman
    ALLIANCE MEMBER

    "Digi-Key" - If you can navigate their website (not an easy task), you will find they have everything you might need.
     
    Last edited: Jun 19, 2019
    lothiandon1940 and Latigo like this.
  11. Should be an electronic/computer store near by or an old tv repair shop.
     
  12. Jimbo17
    Joined: Aug 19, 2008
    Posts: 3,453

    Jimbo17
    Member

    Great old company that made great tachs.
    Jimbo

    Dixco Instruments.jpg Dixco Tachs.jpg
     
    lothiandon1940 and LAROKE like this.
  13. Mike Colemire
    Joined: May 18, 2013
    Posts: 858

    Mike Colemire
    Member

    We still got a radio shack but like was said I'm not going to know the resistance or value if it's missing. I got to much other stuff to do right now, I'll tackle it once I get it on the road.
     
  14. loudbang
    Joined: Jul 23, 2013
    Posts: 19,591

    loudbang
    Member


    Measure the ohms on the ones you do have then extrapolate the difference between the 4 and 6 then add or subtract that number to the 6 and you should be in the ballpark for an 8. :)
     
  15. Mike Colemire
    Joined: May 18, 2013
    Posts: 858

    Mike Colemire
    Member

    That makes sense loudbang!
     
    loudbang likes this.
  16. Clete
    Joined: Feb 6, 2010
    Posts: 20

    Clete
    Member

    Hi Mike. I have an old dixco tach with rusty bezel and cloudy lense, but still has the 3 resistors. You may have it for no charge for the resistors if you pay for the shipping. Clete
     
    loudbang likes this.

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