The back of the gauge (most of them) have terminals S = sender, I = 12 volt positive and G = 12 volt negetive.
The two wires going to the sender are connected to G & S.
If you have 12 volts between I & G and remove the wire at the S terminal and the gauge dosen't go to "empty" then it is the gauge.
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'75 Cuddy with '00 Johnson Ocean Pro 150 horse
Benny
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