The sending units are not compatible with the gauges. You need to replace the sending units with ones from the same manufacture as the gauges. There are some "universal" sending units; I don't know what they are or if they would work with your gauges.
What brand of gauges did you buy?
ex TRUE GRIT
Welcome to the forum
Edit: Also resistance in the wiring sending unit -> gauge will cause false readings.
Last edited by JOHN COOKSON; 09-26-2020 at 06:30 PM.
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