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Thread: Oil Pressure Sending Unit 1972 Series 3

  1. #1

    Default Oil Pressure Sending Unit 1972 Series 3

    Hello,

    I have a bad oil pressure sending unit (the one that works the oil pressure gauge) is there a more affordable option than the stock sender? The Smith gauge is working fine I just need a new sending unit.

    This is on a 1972 Series 3 with 2.25 gas motor.

    Thanks,
    Pete

  2. #2
    Join Date
    Apr 2008
    Location
    The Granite State (NH)
    Posts
    3,435

    Default

    Any oil pressure sender with the correct ohm range (and direction) and the correct thread size and pitch should work, I would think. The trick is finding these tidbits of information. It's out there if you're a proficient and patient googler.

    Bear in mind that senders like that aren't very cheap in general, compared to the idiot light pressure switches.
    --Mark

    1973 SIII 109 RHD 2.5NA Diesel

    0-54mph in just under 11.5 minutes
    (9.7 minutes now that she's a 3-door).

  3. #3
    Join Date
    Apr 2012
    Location
    Massachusetts
    Posts
    58

    Default

    I believe the original oil pressure setup for the SIII requires that odd big can of a sender. The circuit uses a voltage stabilizer and I think the gauge and sender are matched and won't work w/ either a modern gauge or sender...at least that's what I read when I dealt w/ mine a few years ago. I wound up springing for a new sender, solid state stabilizer and have been happy since.

    Here is a decent write up of the arcane setup (article may have a slight error as the stabilizer delivers a steady 10v through the gauge to the sender): http://www.lrfaq.org/Series/FAQ.S.Gu...lPressure.html

    Pangolin has the OE senders at a somewhat reasonable price.

    Good luck...
    '72 Series III 88 "Greenie"
    '85 90 2.5NA "Stinky"

  4. #4
    Join Date
    Oct 2006
    Posts
    1,199

    Default

    I got all my smiths stuff from Gaugeguys.com: http://gaugeguys.com/Smiths/accessories.htm

    To my mind they are way more on the ball than the "other" guys...Nisonger.

    There are two types of smiths oil gauge. The mechanical with a tube, and the electrical with the sender.

  5. #5
    Join Date
    Apr 2012
    Location
    Massachusetts
    Posts
    58

    Default

    my error...and bad memory. the SIII d/n feed the oil pressure gauge from the stabilizer, but I am still not sure that the original gauge is compatible w/ a modern sender.

    here is the G&R thread from my adventure w/ this: http://siteground237.com/~gunsandr/s...pressure+gauge
    '72 Series III 88 "Greenie"
    '85 90 2.5NA "Stinky"

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