Pro Comp gas gauge not working correctly

Discussion in 'Gauge Marks' started by ZoSoIV, Sep 16, 2018.

  1. ZoSoIV

    ZoSoIV New Member

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    Sep 16, 2018
    hey guys just bought a 1970 Z-28 , RS on the resto they used Pro Comp gauges and the gas gauge isn’t working correctly ... when full it shows just over a half tank and empty it shows around a quarter tank ... I’m trying to pin down if it’s the gauge or the gas tank float ... what should I look at first ? Thanks
     
  2. dave@ztech

    dave@ztech Veteran Member Lifetime Gold Member

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    Mar 27, 2016
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    Check the voltage, and see if the correct voltage is at the gauge , if it is then the junk in the trunk/tank is acting up
     
  3. ZoSoIV

    ZoSoIV New Member

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    Sep 16, 2018
  4. Twisted_Metal

    Twisted_Metal Administrator Staff Member Lifetime Gold Member

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    Bloomington, MN
    The gauge is an ohm meter.
    It measures resistance in the circuit through the sending unit.

    It may simply be a mismatch between the gauge and sending unit resistance range.

    Try to find out the model of the gauge to find its intended ohm range.

    If I remember correctly... the sending unit should be 90 Ohms full and 0 Ohms empty.
     
  5. ZoSoIV

    ZoSoIV New Member

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    Sep 16, 2018

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