Seige Engineering used to sell on ebay but they are no longer around at all anymore. I think a lot of guys like Horn Blasters though.

 

Here is my set up. i just put on the fender flares and did the onboard air. its not hard wired yet since i havent had time but this is were i put the compressor and the quick connect

 

im also waiting on a leader hose with check valve for my compressor. with the hose clamps the compressor doesn't budge. takes a great deal of strength to move it. i also put some type of foam between the rail and the compressor to reduce vibrations and noise

 

Those are nice pics. I wanted to add a air guage on my tank also but was scared of water getting in it. I have a few liquid filled gauges but havent put one on.