Re: Gas tank
You can't always rely on the accuracy of the gauge.
I use a NORTHSTAR fuel flow gauge and it is fairly close. I have a new 75 gal tank and after using it all spring and summer and going through something like 100+ gallons of gas, the NORTHSTAR gauge was telling me I had 20 gallons left( I run my Yamaha T9.9 off the tank also and it doesn't go through the gauge) I topped it off with 58 gallons yesterday morning, consider the fuel burnt from the kicker it was close. The regular tank gauge was on empty when I came in last time, I do carry a 3 gal tank for the kicker, so wasn't too worried, buy one never knows.
Like others have said, you just need to get to know how the gauge reads.