There is a wire back there that can be used for the switch. But you have to run the fat power wires to the battery. Under the frame or take plastic off inside. If you go under the Frame just make sure to put the wire in a wire loom to protect it. You wires can go through the tail lights or they...
The ARB hose coupling in the rim is not center of the hole. Maybe you didn't finish installing the tire correctly and that's why its off center. If so, someone should have waited to get the correct pic.
Those couplings you need a good grip to put the hose on and off.
I don't see how you can get...