Power the gauge (switch on), Unhook the wire coming from the gauge to the sending unit from the sending unit terminal. Ground the wire. If the gauge reads full with the wire grounded the gauge is good. Hook the wire back to the sending unit terminal. Run a jumper wire from a sending unit to ground and see if the gauge works then. If it does add a permanent ground wire. With the sender out of the tank you can use an ohmmeter (one lead on the terminal and the other to the mounting surface of the sender) to see if the ohms change as you move the float. If they don't change the sender is bad. since you said the gauge went full scale when you grounded the sender terminal it sounds like your gauge is good, but do all the checks to confirm things.
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Today's Featured Article - Hydraulics - Cylinder Anatomy - by Curtis von Fange. Let’s make one more addition to our series on hydraulics. I’ve noticed a few questions in the comment section that could pertain to hydraulic cylinders so I thought we could take a short look at this real workhorse of the circuit. Cylinders are the reason for the hydraulic circuit. They take the fluid power delivered from the pump and magically change it into mechanical power. There are many types of cylinders that one might run across on a farm scenario. Each one could take a chapter in
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