Fuel Gauge Sending Units compared

This OEM sending unit came from a 1969 Dart in a salvage yard. The resistor's phenolic board had warped, so that the contact would dig under the nichrome wire. In the picture you can see where that happened. The warping also caused the resistor not to make good contact with ground at the narrow end. To stop the contact from digging under the wires, I had my son solder a brass nail head into the worn hole at the end of the contact, to make a nice rounded contact surface. To make a good connection at the ground end of the resistor, we soldered that contact, then epoxied both ends of the resistor to hold it in place. I don't know how long it will last but it's working well now.