dual gas tank switch plumbing

[73kay]

Hey guys just got my 6 port dual fuel tank switch and I want to confirm
a few things:

1. Plumbing: I have 2x 16g tanks both with new 3 port sending units. I plan to plumb 3/8 lines from the tanks to the switch and then on to the mech fuel pump with no return. My delema is the return. I could just do the same thing with the return and pass it down to the vent pipe that will end at the charcoal canister and do its thing with no smells.

Or I could "t" the returns together and go directly to the canister. I'm
Leaning that way bc if the switch is selected on the left tank the right can't vent at all. Right? (I want to cap the 3rd "vent" tube out of the sending units bc I don't want the smell in the garage.)

2. Wiring: should be easy I have two gas gauges in the cab. (I know my left tank isn't setup yet. and I'm gonna use just a simple Knob switch to switch between tanks. So only one wire should be coming from the fuel selector to the dash switch.

3. Misc port: I guess this is just a "breather for the valve itself?

Thanks for your help. A lot of posts on this topic but my setup is a bit different.