getting to the gas tanks?

[baller5040]

I have search many of the threads here and i'm pretty new to the whole mechanics things but would like to get my truck running and in good shape. I have a 1982 chevy short bed and i have the two tanks as many of you already knew that. I had one tank that read past full on the gas gauge but the other one worked fine until the other day and now it has gone the same route of the other tank. I was looking at both the tanks to find out if maybe the ground went out on them and to replace them. But the problem that i am running into right now is that I have no idea how to go about getting to those grounds. I was thinking about taking the tanks off all the way then I looked at the and looks like a hassle. So I was curious if anyone would know of a better way of getting to those sender units to replace those ground wires.