1991 740 non turbo , regina . This is why I am asking. Many years ago I replaced my instrument cluster and since then my fuel gauge reads backwards. The replacement was from another year. I recently removed the entire fuel pump/sending unit for a pump repair. My sending unit is not compressible like others. I can hear something sliding up and down in the tubed chamber and I gather this must be a kind of "float" for the fuel quantity. There are two wires to the sending unit . The entire assembly , pump and sending unit ,has four wires and two are for the fuel pump , two for the sending unit.Could I desolder the wires from the sending unit and reverse them so the gas gauge in the cluster read true? Thoughts?
: Or perhaps reverse the wires at the connector located behind the carpet near the radio antenna in trunk.

Reversing the wires would not work.
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Art Benstein near Baltimore

Answering the same letter three times or more in a row on a Scantron test is absolutely petrifying.

Exactly! A resistor is a resistor regardless of the voltage polarity.
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john

Therre is coiled copper wire inside the sending unit. As the float goes up, there is less resistance and more current sent to the instrument cluster.

You probably could swap the wires around and have a correct gauge. I would pick the under carpet connector just for ease.

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My name is Klaus and I am a V♂lv♂holic