1978 Little red Express truck.
I have a new fuel sender I am installing and it has two threaded posts coming out of the sender unit. I know one is for the hot, is the other supposed to ground to the truck frame?
I don't have a service manual for this truck and the diagram with the new sender does not address it.
There is also an electrical wire coming out of a factory hole at the center bottom of the cab under the truck that is hooked to nothing. Anyone know where it goes?

Found the first answer but still would like to know the answer to the 2nd one.