PHP Warning: Use of undefined constant VBA_SCRIPT - assumed 'VBA_SCRIPT' (this will throw an Error in a future version of PHP) in ..../includes/functions_navigation.php(802) : eval()'d code on line 1 Portable Fuel Tank Measures
Splash, is this your only tank or a second reserve tank. Do you have NMEA2000 network with your engine connected? If so you should be able to manage your fuel consumption and remaining fuel. For any discrepancy just recalibrate fuel remaining when you refill the tank. That's what I do as I have no sensor in the tank. Works well enough for me. I still dip the tank occasionally just to check they are saying the same thing.
I didn't bother with this as ten litres is the most I've used in a day with a polyboat and 40 hp. The Yammy and Lowrance HDS sounder with NMEA starter kit, EP85 and command link cable should allow you to guess the fuel consumption and estimate your tank level.