You can test very easily with a multimeter set to the ohm scale. If you connect the leads to the two sender connections and raise the float. The resistance should change corresponding to the position of the float arm. The sending unit is basically just a variable resistor.
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1999 Wellcraft 22WA-200 Ocean Runner
1982 Grady White Tarpon 190-110 Evinrude-Sold
1996 Striper 2100WA-RIP Sandy
1989 Wellcraft 18-Sport-125 Force-sold
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