[crakarjax]

I've got dealer installed twin saddles on mine and was told that they hold 20 gallons ea.... they actually are 10 gallon each. I know because I ran out of gas!

The problem with these is that they have no sending units in them, and also there is a tank selector in the cab to switch between the three tanks... you'd have to find a selector that also switches the sender wires, which shouldn't be TOO hard to do.

I like the tanks linked to above better since they don't fill through the sides, and apparently they are 15-20 gallon tanks. They would tend to pick up a lot of grime kicked up form the wheels though. Probably a fair tradeoff, especially if you have to worry about a nice paint job. I get gas on my paint every time I fill the things up.