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Thread: 4l80e speedo wiring

  1. #1
    Carb and Points! sparkinnissan's Avatar
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    Question 4l80e speedo wiring

    If there's any site out there that can help,it's you guys!! Im a new guy here, so if this is posted in the wrong area im sorry. I've got a 92 350/4l80e with a 16147060 ECM. I bought an aftermarket speedo and took a shot at wiring it up. My question is which wire do I hook signal to? I've got it hooked to the vssb (C15 lt blue/black) speedo signal. I looked on autometer's site and they show it hooked to the speed sensor. I checked the wires and their not shorted or broke and I have a new speed sensor. So my question is does it hook to (C12) or (C7) or do I have another problem? Thanks in advance for the replies

  2. #2
    RIP EagleMark's Avatar
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    VSSB is a buffered signal to dash speedometer, cruise control and ABS or? I think... that speedo you have wants direct VSS connection? 4l80E has TIS and TOS Input Speed and Ouput Speed too...

    Check this thread for some good wiring diagrams.
    http://www.gearhead-efi.com/Fuel-Inj...-427-PMC-OE-31

    1990 Chevy Suburban 5.7L Auto ECM 1227747 $42!
    1998 Chevy Silverado 5.7L Vortec 0411 Swap to RoadRunner!
    -= =-

  3. #3
    Fuel Injected!
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    yeah you probably need to figure out if your gauge needs a direct pulsed ac signal to it. If so, you'll need to tap off the speed sensor off the back of the transfercase somewhere.

    is this a 2wd or 4wd?

    I am tuning my own 7060' You plan on tuning yours?
    Last edited by chevmasta; 03-15-2013 at 04:06 PM.

  4. #4
    Fuel Injected! gregs78cam's Avatar
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    I porbably have the same speedo in my Camaro, I can check and see which wire I hooked up to it.
    1978 Camaro Type LT, 383, Dual TBI, '7427, 4L80E
    1981 Camaro Z-28 Clone, T-Tops, 350/TH350
    1981 Camaro Berlinetta, V-6, 3spd
    1974 Chevy/GMC Truck, '90 TBI 350, '7427, TH350, NP203, 6" lift, 35s

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