Hey same thing-pre locker install, I got the on board air installed, wires plummed, switches mounted and connected. Surprisingly every thing worked!
The ARB harness makes it pretty dang easy, and the instructions are straight forward. Of course I got kind of anal with the wiring install and sleeved all the wires Techflex wire loom over all the wires, used split loom on the air line. Looks "professional grade" now- for what thats worth
ARB CKMA12 compressor chosen to run the rear locker and supply standby air for airing up tires if my CO2 tank runs dry. If/when I add a front locker still one port availble for that line.
I
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Clean install!