onboard air system

Cleaning out the garage and found some items from a build that never came to be Everything is new in the box. ARB Twin 12V Onboard Air Compressor (CKMTA12) Paid $650 looking to get $600 COMPRESSOR MANIFOLD KIT 171503 Paid $100 looking to get $60 ARB Pressure Control (0830001) bluetooth...

I'm curious what you all think about this. I've spoken with plenty of folks who are happy with the ARB, even though it's considered expensive. I've used a cheap, twin portable compressor for a few years, and it seems faster, but I can tell it's on its last legs. It's time for me to install...

I am going to install an onboard air system. When I look at various wiring diagrams for installing relays on the internet, I get confused. (Apparently I must have understood them at sometime in the past, because I have some extra relays in my tool box !! ). There is a pressure switch in this...