i ended up turning it off because when i'm airing down for trails the flashing hazards are annoying and when I'm airing up the horn would randomly honk before the set pressure is reached. I was ok with it but my friends complained every time lol
so i just rely on my Moorflate gauge and it's pretty accurate.
These are what I use:
Inflate, Deflate, and Equalize air pressure in all 4 tires, all at once. See all of the uses below: Air up 1 to 4 tires simultaneously (Less stress on your compressor!) Air down 1 to 4 tires simultaneously (Less stress on you!) Check all of the tires' PSI from the manifold (No more...
morrflate.com
This allows you to do all 4 at the same time to ensure equal pressure on all 4 tires.
The included gauge is accurate; i compared the pressure shown on the gauge vs the dash and they're the same.
Air Compressor
store.arbusa.com
ARB Single Compressor mounted under the hood. Can fill all 4 tires (35x12.5R18) from 20 PSI to 40 PSI in about 5-7 minutes. I didn't time it but I usually smoke a cigarette when the pump is running, and one cigarette takes about 5 minutes.
Only downside is I have to keep the engine running when airing up.