I totally forgot I was that I was going to post my dual fuel install from this last summer. My main computor crashed (motherboard capacitors blew) so I did not have access to all my pictures. I went out and took some more today. I don't have all the little install pictures I took yet but these will give you the general idea. There has been a lot of dual tank installs but none that just used "one" switch to handle all the stuff (except Gringletaubs and he only used one tank LOL ! ) that goes along with a dual system. The main difference in mine is the "one-way" check valves I use and the 3 way fuel switch. Also my main switch on the dash is a dual throw with 3 rows of 3 pins each. The center row of pins is the "common" meaning they go to the fuel gauge and power. The upper row is the right tank and the lower is the left tank. The one-way check valves are mounted to my fuel water separater filter. This prevents the fuel going back into the other tank. The 3 way fuel switch routes the return fuel back to it's proper tank. I'll make up a diagram showing the fuel lines and the electrical lines later. These last two pictures show the 3 way fuel switch. I know it's hard to make out since I painted everything green. Pictures 5-6-7-8 show the panel switch, again it is hard to see. I have pictures of the switch itself I will get off the old computer later. The first picture shows the left side tank and picture 2 shows the right side tank. I totally cleaned out the tanks and rebuilt the fuse box on both tanks. I also installed new pumps and new fuel level senders. It works great ! Just flip the switch up and your on the right tank, flip it down and your on the left tank.