His gas tanks are like mine, they are under the seats. So this limited me to come up with a fix. Then I remembered something from an old tractor we used to have. It had a glass tube inside a metal housing that showed you how much gas was in the tank. Since liquids seek their own level, all I had to do was think about duplicating this on his boat.
I ran a gas line from the very bottom of his gas tank, thru the cover for the seats, into the area where he sits. I attached that hose to a solvent protected clear plastic tubing I found. I found a plastic red bead that was also solvent protected that would roll inside the tubing. I bent the tubing up the cover and attached it to the cover with some plastic pipe holders I found. I put a brass plug cap on the top and drilled it for a small nipple to run a small line back into the top of the gas tank to vent gauge.
Once I had it all put together, I poured in 2 gallons of gas and marked the gauge. Then 3 gallons (to make a 5 gallon mark), then 5 more for the 10 gal mark, etc till I had filled the tank.
When he came back to pick up the boat he was ecstatic.
I was going to try to locate one of those glass ones that the tractor had but I gave up.
Maybe you guys can up with a better gauge using better materials?
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When people haven't a clue as to what is going on...
they criticize the ones that do.

"I CANT OUTSMART MANY, BUT I CAN OUT DUMB THEM ALL"

1) making it look good in the boat

2) making the connections to the tank truly leakproof

3) not breaking the gage glass once it is installed

On my boat, I can just pull out one of the rear storage compartment trays and see the tank, which while not clear, does show very well the fluid level.

Modified by TRCM at 1:50 AM 2/5/2010

Daiwa / St. Croix / Abu Garcia / Sufix / Humminbird / Motorguide
T & H / Power Pole / BlueWater / Loc-R-Bar / Fury / MercMonitor

There is no glass in this setup. It is all clear plastic fuel hose. Making it leak proof was easy. I used fuel quality connections. As far as looking good in the boat. That wasn't his objective. He wanted to be able to tell exactly how much fuel he had. Not guess with electric gauges. It isn't for everyone, maybe not anyone, but the thing worked for him.

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When people haven't a clue as to what is going on...
they criticize the ones that do.

it is called a gage glass or sight glass, whether it is glass or plastic......

Daiwa / St. Croix / Abu Garcia / Sufix / Humminbird / Motorguide
T & H / Power Pole / BlueWater / Loc-R-Bar / Fury / MercMonitor

If at first you don't succeed,dont take up skydiving

Thanks again and post more ideas.