Fuel Gauge Question

That would be a good idea. Every aftermarket sending unit I've seen doesn't reach the bottom of the tank. With the tank out you can look through the filler neck hole and tweak it accordingly.

Just to expand a bit more than on the thread I linked you, it sounds like you will need to bend the float arm down a bit too. That way it reads the full range of travel. I've had to bend the arm down a bit on each aftermarket sending unit I've dealt with.

At that point you can either "get used to" the way your fuel gauge reads, or get a Meter Match.

As far as the grommet if you need a new one I pointed out a good quality new one to the guy in this thread:
Fuel Filler Neck Grommet Replacement

I bought this exact grommet you mentioned previously. If all goes as planned, I am going to swap it out this weekend, so that I will be all set for Carlisle next week.

As for the sender, how difficult is it to bend the fuel pickup? Seems that it is on the opposite side of the tank from the entry point for the filler neck and would have to be removed from the tank completely in order to bend it. The gauge issue does not bother me all that much. Until my fuel leak started, I would just fill it up when it got basically to Empty. It would take about 10 gallons approximately to fill the tank up from E (gauge still reading only 3/4 full though). I believe my tank is an 18 gallon tank, but it has been almost four years since I bought it, so I don't really remember.