When I bought my 1970 20SF it had a Flo-Scan system on it and no actual fuel gauge. I was not happy because I could not see "how much fuel was left". I have been using it now fro several months and I have come to realize that the fuel gauge is not necessary. I know how much fuel my tank holds - all the way to empty - and I simply watch the fuel used on my flow meter. It has been accurate to within 1/2 gallon when I fill the tank up after a trip.and measure. I love it!