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Tach with 5 wires???

Discussion in 'The Hokey Ass Message Board' started by mustang552, Jul 8, 2011.

  1. mustang552
    Joined: Nov 29, 2008
    Posts: 170


    Can someone tell me how to wire an old (I think SUN, no name or numbers anywhere inside or out) tach? It has a red, a white, a blue, a yellow, and a black. I hooked up the red to 12 volts, the black to ground, and the green to the distributor side of the coil. did not work. I can't find anything on it on the internet. Please help!
  2. 4dFord/SC
    Joined: Sep 12, 2004
    Posts: 832


    A picture would help. At a guess, blue is for the light.
  3. Jobe
    Joined: Oct 19, 2004
    Posts: 1,248

    from Austin, Tx

    If it's an old tach it probably needs the transformer or whatever the other part was called that came with them.
  4. Normal Norman
    Joined: Aug 9, 2006
    Posts: 510

    Normal Norman
    from Goshen IN.

    I had an older tach not long ago(not a sun) that had 5 wires. The usual 3 went to +, coil,and ground. The remaining 2 went to light and ground for the light. I had to remove the unit from the cup to figure out what went where. Perty easy after that. Normal Norman
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  5. smarg
    Joined: Nov 18, 2008
    Posts: 1,069


    Nailed it. This stuff called technology did away with that extra stuff. :D

    You would be better off buying a new retro sweep tach or whatever it is.

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