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tach wiring

Discussion in 'The Garage' started by noJeepshere, Nov 12, 2003.

  1. noJeepshere

    noJeepshere I Drive Trains! Premium Member

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    ok pulled an autogauge tach out of a 79 chev pickup. four wires, black is ground, umm... what are the red, green, and white wires for? and where do i need to get the signal from? what wires do i need? blah blah blah yada yada yada. thanks guys.
    CHEVYs rule, but GMCs are better /forums/images/graemlins/rotfl.gif
     
  2. Cmoe

    Cmoe 1/2 ton status

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    Here is the Installation instruction for a Autogage 3 3/4" Tachometer Model #2300,2301 & 2302

    White= Dash lights (12v+)
    Red= Switched (12v+) source on fuse box (or add inline fuse to switched source)
    Black= Ground(12v-)
    Green= to Tach Terminal

    *They show both the Black and the Green going into the engine compartment (but I just gounded mine inside the truck).

    Also open it up and make sure switch inside is set to the correct engine cylender type.

    Hope this helps.....
     
  3. 350350

    350350 1/2 ton status

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    Yeah, what he said! /forums/images/graemlins/grin.gif

    Also, your '79 should be an HEI and there's actually a place on top of your coil cover, in the center of the distributor cap, marked 'tach'. It's right next to the power lead that goes into the coil. It is a male spade inside (you won't be able to see it inside the cover) and you can use a regular female spade connector if you don't have the fancy-schmancy GM connector. You'll just have to fish around a little...

    Wow. That's about as long an explanation as I can give. /forums/images/graemlins/1zhelp.gif

    Paul 'X' /forums/images/graemlins/thinking.gif
     
  4. TrcksR4ME

    TrcksR4ME 1/2 ton status

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    What they all said. When I did mine I think I wired the dash lights into the power wire, so my tach light is always on when the truck is on (used an ignition power source).
     

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