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E21 S52 Swap Tachometer Question

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    E21 S52 Swap Tachometer Question

    I'm having a hard time figuring out how to get my tach to work. I've checked the wiring and not seeing any issue. What I've done is swapped out my 320i m10 tach for a 323i m20 motometer tach. The m10 tach would sit around 4k when the motor was running and now the new tach does nothing. Can I bench test the tach to make sure I did not buy a bad one? Or is there something I'm not doing correctly?

    #2
    Just read your other post. Did you check your grounds again?

    Also, did you only change the tach? Or did you change the whole cluster?
    Last edited by sweet3; 06-29-2017, 12:26 AM.
    PNP Adapter Harness Wiring for M52TU, M54, S54, M60, M62, M62TU, S62, M50, S50, M52, S52 & MORE

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