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Thread: Tach signal wire HELP

  1. #1
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    Question Tach signal wire HELP

    To all the electric gurus, I need a pulsed negative for my Speedhut tach. Can I tap the #4 pin at the ECU to achieve what I need? Is this a reasonable solution? Suggestions?

    I have the FSM and a color schematic of the electrical system but reading an electrical diagram is not my strong suit. Well, ok, I'm a wiring theory moron but more than capable of soldering and heat shrinking.

    Thanks!

    '78 280z
    1977 280Z - Sold 10/1986
    1978 280Z - Current and forever

  2. #2
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    The stock tach uses the blue wire from coil negative. Won't that one work? Not sure what you mean by "pulsed negative". Why do you think that pin 4 would work?

  3. #3
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    Pin 1 is the signal from the negative side of the coil.
    My last three sports cars while I still owned all three:

    2001 BMW Z3 Roadster 3.0i soft/hard top (sold)
    1966 Ford Mustang Coupe (sold)
    1978 Datsun 280Z (enjoying very much )

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