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Thread: Tachometer Problem

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    Lightbulb Tachometer Problem

    I have a 1971 240Z that has a tach that operates intermittently. There are days it works fine, other days it stays at a fixed reading. I want to get it working consistently. Suggestions, ideas? Thanks.

  2. #2
    Registered User 240ZX's Avatar
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    Ken, Welcome! I do not have the answer to your question however, on this site (and other Z sites as well) you can use the search function to surf through the archives. Pretty much every question for repair and or modification has been asked and done before, so as you can imagine, there are a load of answers. Hope this will help you in your sesarch for an answer....and again, welcome aboard!

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    Thanks. I'll check that out. I bought the car about a month ago and am addressing the items that need attention as I find them. Overall, I am having a ball with the car.

  4. #4
    philo "Z" opher Zedrally's Avatar
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    I asked this question years ago, so far no-one has been able to give a satisfactory answer.

    My thoughts are that it may be ground [earth] related.

    Good luck and post the solution if you find it.

    MOM
    Mike of the Mire

    73 240Z Rally
    77 260Z Touring

    Bogged but not beaten

  5. #5
    Biafra for President e_racer1999's Avatar
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    isn't the tach powered through the dizzy? i'm having problems w/ mine, and i think the PO may not have hooked up the electric dizzy properly....
    Jason King
    6/72 240Z / HLS30 89646 (Yellow)
    1996 Infiniti I30 *I finally have all Nissans again!*
    1971 510 4door (wife's car)
    IZCC Member #14186

    Quote Originally Posted by xray View Post
    As unfortunate as it may be, if you want to vintage race, go Euro....If you want to race for real, stick with the Z!

  6. #6
    philo "Z" opher Zedrally's Avatar
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    The tach actually picks up from the points. Break that connection and engine no go.

    Basically, there is a transformer type connection which converts the pulses from the dizzy to an analogue re-out [tacho]. If the connection is broken or intermittant on the other side [tach] side then the engine will run with no tach readout.
    This is why I think I have a problem in the tach return wiring, but I really don't want to pull the dash to find the loose connection.
    Mike of the Mire

    73 240Z Rally
    77 260Z Touring

    Bogged but not beaten

  7. #7
    Biafra for President e_racer1999's Avatar
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    tomorrows my "work on car" day, so i'm gonna troubleshoot. i'll let ya know if i find anything miraculous!
    Jason King
    6/72 240Z / HLS30 89646 (Yellow)
    1996 Infiniti I30 *I finally have all Nissans again!*
    1971 510 4door (wife's car)
    IZCC Member #14186

    Quote Originally Posted by xray View Post
    As unfortunate as it may be, if you want to vintage race, go Euro....If you want to race for real, stick with the Z!

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