Who cares they are over rated any way!! I can tell when I run out of gas all by myself!!
I have never had a working gauge on my boats, they are never right any way! I never use more then 20 gal a trip 99.9999 % of the time and I hold 60 gal, so as long as I filled up after every trip I A OK.
The new boat has 110 gal gas so I am sure I never going to worry there either.