I have an 1984 Mustang lx convertible. I am in the middle of a restoration and I need some help. Fuel gauge does not work and always reads empty. I pulled the sender out to check it, and it OHMs out properly so that rules out the sender. I checked for voltage going in to the sender and I am getting a pulse ranging from 0-10 volts. When I temporarily connect to ground, the gauge does not move. I tried to use a 80 amp resistor between to simulate the sender and the gauge still won’t move. I pulled the instrument cluster to verify voltage at the gauge. I have 12 volts going into the voltage regulator, the pulse coming out of the gauge, and the pulse coming to the sender. All is well but the gauge does not budge. Any suggestions?