1998 Hatteras 52c Rochester 8600 style guage conversion

I have read most of the posts here regarding some of the conversions, but I would think a wireless sender and an cell phone app and or small digital readout would do the trick. Since I have the 3/4-7/8 full freshwater tank leaks this is pretty high on the repair list and the tank repairs on the winter repair list. ThanksContinuing to crawl under the master bed mattress as I fill the STB tank is not an option.

IMO, the only way to go is with a Hart Tank Tender. Easy to install, no moving parts, and accurate to within a couple of gallons at all levels once calibrated.