dual tank wiring

[alec22]

This is what I've got to work with...I have the two green colored wires that run from the selector switch. They are cut about half way down the frame rail but they are there. I do have the tank selector switch still intact inside the truck. This is hooked up with the green colored wires and another wire connected to the fuse panel. Also, I have one pink wire that runs frome the sending unit into the harness/firewall connector. This wire does work as it gives a reading on the one tank that is installed.

How would I hook up the passenger side (the one that is currently missing) tank sending unit so that it reads on the fuel gauge when that tank is selected? How do I hook the drivers side tank (the one I have installed in teh truck) once I need that pink wire for both tanks?

Also, the truck has holley carb so there's no fuel return line, and the vapor canister has been removed so there's no vapor lines either. Would I be better off installing a 3 port valve or a 6 port valve. I assume the 6 port valve was the stock application. I can get one of these (the 6 port) and the plug that goes into it. The plug would be a big help since, like I mentioned above, there's no wiring left anymore!

Thanks for any help you can give me!!