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Thread: 1990 Ram 50 tachometer problem

  1. #1

    Array
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    Offline
    Join Date
    05-14-2022
    Posts
    15
    Location

    Williamsburg VA
    Vehicle

    1990 Dodge Ram 50
    Engine

    4G64

    1990 Ram 50 tachometer problem

    I have a 1990 Dodge Ram 50 2WD pickup. I purchased a used combination speedometer & tachometer unit and just installed it in my truck. I've read how it is basically a "plug and play" change to make requiring only a change of the oil pressure sending unit. I installed a genuine Mitsubishi oil pressure sending unit. My issue is upon running the truck since installation all the gauges work fine, but the tachometer does not work. Is there something I'm missing? Was I sold a bad unit? Is there a way to trouble shoot the tachometer? Any help will be greatly appreciated.

  2. #2



    Array
    Status
    Offline
    Join Date
    03-06-2018
    Posts
    478
    Location

    Tucson, AZ USA
    Vehicle

    1987 Dodge Ram 50
    Engine

    G54B
    I think the tach signal comes off the (-) terminal of the ignition coil, see if you can find whether that's connected or not.

    Not sure about FI models like yours, but on carb'd models that would be a white wire, and that (-) coil terminal would have one other wire connected, from the ICM/ignitor sensor in the distributor.
    1987 Dodge Ram 50 4G54 RWD longbed ("Elmo")
    1979 Lancia Beta Zagato spider ("Lola")
    1982 Lancia Beta Zagato spider ("Luigi")

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