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Thread: 90° Tachometer Adaptor for original Stewart Warner J3 Cub Tachometer

  1. #1
    Grant's Avatar
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    90° Tachometer Adaptor for original Stewart Warner J3 Cub Tachometer

    I have the correct cable but it needs a 90° adaptor to make it between the tank and the back of the instrument.

    This is not my instrument but it uses the exact cable connection shown below.

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  2. #2
    www.SkupTech.com mike mcs repair's Avatar
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    Some(all??) right angel adaptors reverse rotation direction. Learned that the hard way


    Sent from my iPhone using SuperCub.Org

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    irishfield's Avatar
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    They are available both ways Mike. I have one somewhere, but I believe it is an old reversing off a J3.

    ACS has them for 80 bucks or so Grant. https://www.aircraftspruce.com/catal...ve10-05504.php

  4. #4
    Grant's Avatar
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    I thought it would be that easy too but unless i'm missing something that one will not work. It's backward from what I need. The instrument is female thread and female drive. i'll probably need to call Keystone in the morning.

  5. #5
    Grant's Avatar
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    UPDATE -

    Ken @ Keystone Instruments just gave me a lesson in Stewart Warner tachometers.

    The original tachs came in two case types...

    • straight drive
    • 90° drive


    I have a straight drive....ughhh.

    They are going to fix me up though!
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