One I have around is a Pacbrake 625 which I'll probably just use that - they also have some nice air spring controls too but I'd need to order those bits. Its not big enough for high cfm tools (except for short bursts) but should work well. I've always wondered what the ratings are on the stock compressors are. They do have some nice design features with the integrated air drier and all. Might try to figure a way to use some of that if its viable. That is way down to the road though. Probably will pull the H2 in this winter. Right now I have my GMC torn apart for a LOT of new things like new Katzkin leather, pulling and cleaning carpet, replace one if the infuriating blend door actuators, and a bunch of other stuff.

 

 

Yours should be similar, anyway for the twin compressor AS unit its not a pressure "switch" but a pressure "sensor". If you have a Tech2 you can see the actual pressure levels (see attached)

 

 

Tech2's not that expensive about the cost of 500 miles worth of fuel here in UK !!