Wired up the fuel selector switch which is located near the top of the center console. The switch controls a 6-way electric fuel selector valve. The reason for the 6-way system is to ensure the feed and return lines for each wing tank are in sync with each other (i.e. excess fuel fed from the left tank is also returned to the left tank). So long as I hook the hoses up right, I won't be cross-feeding my fuel inadvertantly.
The switch is a plain one, so I added two basic green LEDs that light up whenever one tank or the other is in use. Having light indicators is an easier way to tell at a glance which tank is feeding.
Back side of the console: All wired up with selector and power supply in the background.
Left tank selected ("Main" on the switch plate).
...and right tank selected ("Aux"). The other holes are for ignition, trim indicators, and USB charge.