Question about 2006 Peugeot 407 1.6

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Peugeot 407 fuel gauge not working and light is on

The unit sender resistance decreases when I am adding fuel. there is two wires connecting to the unit sender I disconnected them from unit sender and turned on the iginition switch they both reads positive voltage! white one 5.22 volts and green one 5.13 volts. is that how it should be ?

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