I have a Model 4 with 13 gal and 6 gal wing tanks. I have a very difficult time judging my fuel level. One tank has a piece of clear fuel line coming out of the bottom of the tank and looping up to the top where it reinters the tank. This is inside the wing root. The other tank has nothing. The tanks are not painted so if you look real hard, and the lighting is just perfect, and you roll the plane back and forth, you might see the fuel level through the fiberglass. Often times I think I am getting low on fuel and top off only to find I still had 10 gallons of fuel left. I am looking for ideas for a decent fuel sight guage. Does anyone have any good ideas or photos?

Thanks~Cain B