Pro Comp gas gauge not working correctly


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


Staff member
Lifetime Gold Member
Feb 26, 2004
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.

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