I fixed my fuel indicator problem this past weekend. I had to drop the 36 gallon tank first. It had about 9 gallons in it so I got it part way down then siphoned the gas out. There are 3 straps holding it up there and the deep socket only fit on one of them. The others, I had to cut off the bolt end with a hacksaw cause it was way too long for the socket. Anyway I got it down, pulled off a few hoses and the 4 wire electrical plug and had access to the big unit in top of the tank. There is a big (8" or so) plastic ring which has to unscrew then the whole gas pump, filter and sending unit come out as one unit. I checked the sending unit on the bench with my trusty VTVM in the ohmmeter mode. It was open and every once in a while would make contact so it was bad. I was able to take it apart, find the washer looking thingy with crud on it, turn it around and make it work. Putting the tank back together was challenging in itself but I did get it all together and it worked great! So the bottom line is, the sending unit was bad!
Thank you all for your wonderful comments!