I previously read that. It was mentioned in that post;
"FUEL TANK SIZE was one of the options. 65gal was the biggest he could go to. If I remember correctly, the options were 26, 28, 36.5, 40, 45, 50, 65."
Wasn't sure if anything changed since then. I can set the tank up to gravity feed but if I can't reprogram the fuel gauge I'd lose the benefit of it. The other option is to put a pump on the auxiliery tank and just fill the main tank whenever it gets low using one of the uplifter switches. I'll go that route. Thanks!