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  1. #1
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    Member No: 151401 mormax is an unknown quantity at this point mormax's Avatar
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    Yes | No

    Instrument cluster malfuntioning

    I need help! The speedo, mileage gauge and fuel gauge are not functioning in my 1988 535i. It started with the speedo and worked it way to the fuel gauge. I tried a rebuilt circuit board with new batteries and I just replaced that with a used cluster from a 635. Same trouble. I checked the fuses, the connections and the ground. All seem to be okay. Any ideas. Thanks1986 635CSI 5sp
    1988 535i auto
    1988 535is 5sp
    1995 M3 5sp


  2. #2
    TJ
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    Re: Instrument cluster malfuntioning

    could be a problem with part of the wiring harness running to the rear of the car that contains the wires for the speed sensor in the differential and the fuel level sensor

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