thanks for this link Tim.
Also, the wiring on my van is very old and brittle. The female plug cap for the sending unit disintegrated when unplugging it.
I am having a time finding a new cap to solder on. Do you have any suggestions? Someone at Napa said to just solder on a spade head. I am not sure I like that idea. but will go with it if I can't get the proper plug.