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Robert, The sending unit is accessible when you trim the motor all the way up. It has a plastic lever that rides on the motor and activates a rheostat that runs the gauge. assuming that the electrical connections are good, including the grounds, with the motor up, move the lever and see if the gauge is working. If it jumps around, you probably have water in the sending unit and it will have to be replaced. If it works properley, the arm could be out of adjustment. Remember the ignition key has to be on. Let us know what you find.
Dick
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