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Thread: rpm tach wiring

  1. #1
    Join Date
    Nov 2007
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    84 318i

    rpm tach wiring

    can someone please talk me through wiring up my rpm tach
    ok so ever since my m20 swap my tach hasnt worked, want it to work now. my car is an 84 318 with an 87 m20b25 swap, i heard its possible to hard wire the tach, but im not sure how to go about that.
    84 318i drift car
    04 mk4 gti 1.8t
    96 e320
    63 plymouth valiant




  2. #2
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    IIRC the early models have a C104 connector in the glove box. That's what sends the tach signal. Later M20s send it through the C101 connector. That's about all the info I have for you.

    Status: Someone put glitter in my oil. Wait. Why's all my oil outside the engine? What's that knocking?

  3. #3
    Join Date
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    Quote Originally Posted by protomor View Post
    IIRC the early models have a C104 connector in the glove box. That's what sends the tach signal. Later M20s send it through the C101 connector. That's about all the info I have for you.
    is that the white conector with the red/blue, green/purple, and the brown wire coming out of the harness near the ecu?
    84 318i drift car
    04 mk4 gti 1.8t
    96 e320
    63 plymouth valiant




  4. #4
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    *shrugs* it's a 2 wire I believe. But there's a few connectors like that in the area. I don't recall colors off the top of my head and I wouldn't put it past BMW to change it up.

    Status: Someone put glitter in my oil. Wait. Why's all my oil outside the engine? What's that knocking?

  5. #5
    Join Date
    Nov 2007
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    moreno valley ca
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    84 318i
    i figured it out! my harness is the is out of a 90, so the rpm signal runs through the c101 not the c104, so all i did was wire the black wire in the cluster to pin 9 in the c101
    84 318i drift car
    04 mk4 gti 1.8t
    96 e320
    63 plymouth valiant




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