Fuel Tank Sending Unit with Gasket

My original was a mess. This fixed the problem in short order.

A fuel gauge is a must.No more gauging the tank.Top quality ans east installation

My swiss mog did not have one. Easy install, wires were was already in the harness.

Not really a review since I cna't get the D#$% thing to work. One wire from the sender, but three wires on the back of the gauge. I think the sender wire goes to the center terminal, but what connects to the other two terminals? + is power & - is ground? Sender seems to work when connected to a meter, but the needle doesn't move if connected as mentioned. Please help.