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Thread: Oil temperature quandary

  1. 12-04-2021, 05:54 PM #1
    pocketscience
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    Oil temperature quandary

    I've picked up a restored combo gauge dated 4/72 with a 150C oil temp gauge, and when it's connected to my original '70T sender (marked 150C) it pegs high immediately. I know the sender is fine as it works well with my original T gauge. I've checked the resistance on the sender but it seems fine (just over 100 ohms when cold, and below 70 ohms after running for a few minutes). From my reading the senders were the same from late 69 to 76 or so?

    I'm guessing I need the gauge looked at, but given it's previously restored (not by me) I thought I'd check with the brains trust if I'm missing something dumb.


    Cheers,
    '95 993 | '70 911T
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  2. 12-05-2021, 05:35 PM #2
    30westrob
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    Check resistance of the sender wire at the gauge. That will tell you if the wireing from the sender to the dash is working. If the gauge has a good sender input, good grounding, and power, then I would suspect a gauge problem. Rob
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  3. 12-06-2021, 06:33 PM #3
    pocketscience
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    Thanks Rob.
    '95 993 | '70 911T
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  4. 12-06-2021, 09:20 PM #4
    edmayo
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    With power on disconnect wire at sender, gauge should go full scale one direction, now ground sender wire, gauge needle should go full scale in other direction. If so gauge should be good.
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