OER Temp Gauge Woes

Discussion in 'Electrical Systems' started by 1974TypeLT, Oct 19, 2017.

  1. 1974TypeLT

    1974TypeLT Veteran Member

    693
    1
    Mar 19, 1999
    NW, FL USA
    Does anyone besides OER make stock replacement engine temp gauges, as I have had problems with theirs misreading?
     
  2. Twisted_Metal

    Twisted_Metal Administrator Staff Member Lifetime Gold Member

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    Feb 26, 2004
    Bloomington, MN
    It may be the sending unit.
    The gauge and sending unit need to be calibrated to each other.
    (The temp gauge is just an Ohm Meter with a face markings calibrated to correspond to the temperature experienced by the thermistor in the sending unit.)
     
    FlaJunkie likes this.
  3. 1974TypeLT

    1974TypeLT Veteran Member

    693
    1
    Mar 19, 1999
    NW, FL USA
    Thanks for the reply and reminder. I had forgotten when over a decade ago had to use an in-line resistor to compensate
     
  4. 1974TypeLT

    1974TypeLT Veteran Member

    693
    1
    Mar 19, 1999
    NW, FL USA
    I contacted Classic Ind and they said their TU49 temp sensor is specific for the OER #6489856 engine temp gauge. I hope they are right, so I can avoid resistor recalibration
     
  5. 1974TypeLT

    1974TypeLT Veteran Member

    693
    1
    Mar 19, 1999
    NW, FL USA
    Twisted Metal, The TU49 temp sending unit did not help with the OER temp gauge under-reading. I can't remember if resistors will work on an under-reading or over-reading temp gauge? It is a new temp gauge and the thought of having to re-install another one is not appealing.
     
  6. Twisted_Metal

    Twisted_Metal Administrator Staff Member Lifetime Gold Member

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    Feb 26, 2004
    Bloomington, MN
    This link is for an autometer temp gauge but I believe they all work the same in the respect that resistance through the sending unit drops as the temp goes up.

    https://www.autometer.com/resources/index/faq_view/id/11

    In other words.... Adding a resistor will lower the reading on the gauge.

    Hope this helps!
     
  7. 8pack

    8pack Veteran Member Lifetime Gold Member

    2,382
    70
    Aug 29, 2007
    Pittsburgh, PA
    I am having a similar issue with my factory gauge. It reads 40-50* low. I have tried ever possible temp sender with no luck so I think the Gauge needs re-calibration.....

    Anyone have suggestions on who can re-calibrate and set me up with a matching temp sender?

    Thanks!
     
  8. 1974TypeLT

    1974TypeLT Veteran Member

    693
    1
    Mar 19, 1999
    NW, FL USA
    Thanks for your responses. I have had bad luck with OER gauges. This is probably the 3rd in 10 yrs. The last one the needle would just stick in the 6 o'clock position and now this one barely wants to budge about the 100 degree mark. I doubt there are any other suppliers out there and rereplacing the temp gauge requires tearing into the instrument cluster again.
     
  9. 1974TypeLT

    1974TypeLT Veteran Member

    693
    1
    Mar 19, 1999
    NW, FL USA
    Did you ever find a temp sending unit that worked with your under reading gauge? I think I need one that is < 70 ohms at 220 degrees F. I am not sure where to find one.
     
  10. John Wright

    John Wright Veteran Member Lifetime Gold Member

    14,228
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    Aug 9, 2002
    Rustburg, Va
    Does Daniel (member here) still do the factory style gauges? Maybe he can help.
     

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