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**tachometer help**

Discussion in 'The Hokey Ass Message Board' started by lesabre59, May 9, 2011.

  1. lesabre59
    Joined: Nov 8, 2001
    Posts: 699

    lesabre59
    Member

    Removed the bucket, it has a 4,6,8 cyl selector. The front face has "Made in the USA" on the bottom and no other markings. Any idea who the manufacturer is? Since it only has 2 wires im assuming it requires a sending unit? Especially since one of the wires is a light.
     
  2. Da Tinman
    Joined: Dec 29, 2005
    Posts: 4,222

    Da Tinman
    Member

    uh,, we need pics.
     
  3. lesabre59
    Joined: Nov 8, 2001
    Posts: 699

    lesabre59
    Member

    ooops, here the pic
     

    Attached Files:

  4. Tenacious A
    Joined: Nov 14, 2006
    Posts: 284

    Tenacious A
    Member
    from Willis Tx

    No sending unit required. Looks like an old sun brand.
     

  5. lesabre59
    Joined: Nov 8, 2001
    Posts: 699

    lesabre59
    Member

    So one wire to "tach" on HEI and the other a switched hot? Do the ground come from the body/column?
     
  6. Tenacious A
    Joined: Nov 14, 2006
    Posts: 284

    Tenacious A
    Member
    from Willis Tx

    Yup, you got it
     
  7. Uh I am seeing 4 wires not two. Rwed to switched power, green to the tach supply either the coil or in your case the Tach terminal on your hei. That leaves two wores to deal with for the light and the ground, black would be my choice for ground but I am not seeing black so whatever wire supplies the light is not the ground the other is.
     
  8. lesabre59
    Joined: Nov 8, 2001
    Posts: 699

    lesabre59
    Member

    Actually there are just 2 long wires, its rolled around in the pic.
     
  9. lesabre59
    Joined: Nov 8, 2001
    Posts: 699

    lesabre59
    Member

    bump for the afternoon crowd
     
  10. OK now I see it. Sorry for the bad advice.
     
  11. cac646
    Joined: Feb 7, 2007
    Posts: 176

    cac646
    Member

    Just picked one of these tach's up at a swap meet. Anybody know if it will work with a Petronix ignition? Would the wiring still be the same as described above?
     
  12. squirrel
    Joined: Sep 23, 2004
    Posts: 55,942

    squirrel
    Member

    You'd wire it to the negative side of the coil. Try it, see what happens. Make sure you ground the tach body to the car.
     
  13. F-6Garagerat
    Joined: Apr 12, 2008
    Posts: 2,652

    F-6Garagerat
    Member

    Kinda looks like an "Airguide" marine tachometer.
     
  14. Larry T
    Joined: Nov 24, 2004
    Posts: 7,875

    Larry T
    Member

    Maybe a Faria (mid 60's), seems like they looked like that and had a two wire hookup.
    Larry T
     
  15. slowmotion
    Joined: Nov 21, 2011
    Posts: 3,330

    slowmotion
    Member

    I remember having a very similar one in my Valiant years ago. Maybe an unbranded R A C?
     
  16. cac646
    Joined: Feb 7, 2007
    Posts: 176

    cac646
    Member

    tried hooking this up to my hot rod with an accurate tach and it seems to respond very slowly and doesn't seem to get up to the correct rpm. Seems to read correct at idle but moves very slow.

    Any ideas as to what might be wrong?
     
  17. 14Hotrods
    Joined: Jul 28, 2011
    Posts: 13

    14Hotrods
    Member

    I have a tach that looks just like yours. Made in USA, on it. No other markings, and only 2 wires. I wired one to the "tach" position on the HEI. The other came from the light bulb. I mounted on metal dash so assumed the tach housing was grounded there. Mine works like that.
     
  18. cac646
    Joined: Feb 7, 2007
    Posts: 176

    cac646
    Member

    It sounds like I'm having trouble with the tach due to my Pertronix Ignition - apparantly the electronic ignition doens't have enough juice to power the tach??

    Does anybody know if one of the MSD tach amps can be used to boost the signal??
     

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