Hindsight is 20/20

My original Challenger sending unit looked really nasty so I replaced it. With all the trouble people have been having with the new ones I was curious what my original one looked like inside. It looked almost brand new inside the cover. It had stopped working because the pin that makes contact with the resistor was worn. I bent the contact slightly so it touched the resistor again. That and an EvapoRust soak is all it would take to make mine useable again. Your experience may differ.

I've heard that an extra ground wire soldered to the main body and the float arm helps to make the new ones more accurate.