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Thread: Oil pressure guage calibration

  1. #1
    Senior Member Bitsyncmaster's Avatar
    Join Date:  May 2011

    Location:  Leonardtown, MD

    Posts:    7,722

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    Oil pressure guage calibration

    I had a request from an owner to relate the resistance (from the oil sender) to each mark on the gauge.

    76 ohms = 80 PSI - 162 ma.
    63 ohms = 3/4 mark - 173 ma.
    43 ohms = 1/2 mark - 191 ma.
    26 ohms = 1/4 mark - 219 ma.
    0 ohms = 0 PSI - 321 ma.

    Note the current shown is the power on the gauge (14.0 volts). So I suspect the current sinking in the sender is 1/2 that current.
    Dave M vin 03572
    http://dm-eng.weebly.com/

  2. #2
    Senior Member
    Join Date:  Nov 2014

    Location:  Alexandria, VA

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    Would something like this work?

    https://www.finditparts.com/products...iABEgKFpPD_BwE

    Datcon Instruments Scale Range: 0-80 PSI/0-5 Bar Resistance: 0-90 Ohms Lighted

  3. #3
    LS Swapper Josh's Avatar
    Join Date:  Mar 2013

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    This is very helpful dave! Thank you for this.

    On my swaps I use a combo sender/light unit to ensure everything on the dash works properly.
    I "calibrate" it with a 300 ohm resistor in parallel but it is a compromise.

    https://www.summitracing.com/int/parts/vdo-360025

    5.3L LS4 + Subaru 6spd 314whp/348ft-lbs
    Getting it back on the road!
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  4. #4
    Senior Member Bitsyncmaster's Avatar
    Join Date:  May 2011

    Location:  Leonardtown, MD

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    My VIN:    03572

    Quote Originally Posted by dmcnc View Post
    Would something like this work?

    https://www.finditparts.com/products...iABEgKFpPD_BwE

    Datcon Instruments Scale Range: 0-80 PSI/0-5 Bar Resistance: 0-90 Ohms Lighted
    That would probably work but I would guess the gauge would read higher since our 80 PSI requires 76 ohms and this sender would be 90 ohms at 80 PSI.

    This was from an owner that wanted to drive the gauge with his EFI ECU. For that and most of these old gauges you would just drive a MOSFET with a PWM (pulse width modulation) that sinks the gauge into to ground. So he would use any sender and read the voltage and convert that to a PWM. That is what I did with my fuel gauge ECU.
    Last edited by Bitsyncmaster; 01-27-2020 at 10:04 AM.
    Dave M vin 03572
    http://dm-eng.weebly.com/

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