sending unit or fuel guage

[sgreene]

Guy, there is a post on the under dash fuse block that reads Fuel Ga. Am I correct when I assume this is the post wher the sending unit plugs in. If so, am i correct when I assume that a change in state on this post froom open to grounded should result in a change on the fuel guage. Trying to determine which is bad. So is it basically power flows through the gauge looking for a path to ground which is regulated byt the potentiometer in the sending unit. Therefore this post is there for convenience but actually is fed from the guage so removal of guage is not needed when changing the sending unit. This post has voltage to it. Or am I totally wrong and this post is guage power and the sending unit plugs in somewhere else like in the back of the guage? Any hints on how to trouble shoot would be most appreciated. Its a 71 C30 1 ton