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  1. #1

    Question 91 c1500 5.7l V8 tach connection

    Hi, on my 5.7 v8 i have the divorced coil on the ignition and it has 2 plugs with pink and white wires on each plug. Where would I connect the green tach wire on this coil and would it be on the plug which goes to the distributor or the other. Thanks and great forum

  2. #2
    stephan's Avatar
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    Your tach wire goes on the (-) negative side of the coil. It would be the same one that goes to the distributor. Look close, it should be marked - or "negative". The other side of the coil is the supplied 12Volts "in" & powers the coil.

    The reason I say look closely is because a coil will work even if it is wired backwards, so you should check this first before you hook up your tach.
    Last edited by stephan; 11-29-2010 at 06:38 PM.
    1988 Chevy C-3500 2wd (no pic)
    350 c.i. 5.7 L Stock Block, 4 Bolt Mains
    L-31 Vortec Heads, Edelbrock Cam & Intake,
    Holley 650, Flowtech Headers, Magnaflow exh.
    Jet Trans 700R4, B&M Ratchet, 4:10 gears,
    3" susp. lift kit "shadetree"
    No rev limiter, No speed limiter lol

  3. #3


    Actually, if you follow the wiring harness away from the coil a bit, you'll find a terminal on a white wire. That's the tach lead.

  4. #4


    Thanks for the info, there is a terminal on a white wire on the coil but its on the one that does not go to the distributor

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