just bought my first boat 2007 Larson LXi228. Yesterday I went to my local lake and started with a full tank 35 gallons spent 4 or so hours out and pulling the bout out of the water the tank took 12 gallons and gauge was still on full before filling it. Once in a while I would see the gauge twitch but stay at full. I have many years experience with hot rods so I thinking the sending unit need to be replaced. My question is how do I get to the tanks sending unit? Any instruction or pictures will help vs just pulling things apart and hoping I am doing it correctly. It looks like the filler hose goes under the boat but I don’t see an access in floor? Appreciate any help!!