[PbFut]

Attached is a schematic for the switch and list of wire connections and gas line Port connections for the valves. All the bridge connections on the switch can be done using short or even bare wire given the pins are exposed.
Understand this is for a 3 tank set up. If only 2 tanks than simply follow the schematic in the boxed instructions.
I pulled the fuse photo from this sight a while ago. Sorry don't recall the member so I can't give credit.
I used 12 Gauge auto wire. Even after a few cycles in a row, I sensed no heating of the wire or switch. A 10 amp fuse is recommended in the manufactures literature.

For simplification to me, I did not draw a schematic of the valve connections. I think it is easier to follow with simply a list of the leads on the valve.

It was a fun project to do but it is for sure not going to meet every users need. It works perfect for my needs. I switch the supply, return and sender signal, with one click on a 3 position rotary switch in the same position as the original tank selector switch. No flip flopping tanks, no overfill of the main, no out of sync fuel gauge.