The top button is a regular door bell chime rated at 10-16V. Below is an off-on switch so that the compressor is not on all the time. Primarily for overnight parking and extended parking so it won't wear down the batteries.
The 1 gallon air tank mounted on the
frame. The compressor is mounted in the
ammo can under the passenger side. Wiring
is not yet hooked up, but air lines are in place.