On board air questions

I took a set of train horns off a truck today so now I have a 150psi compressor and a pretty good size air tank so I figured an on board air system would be cool to have.

Question is what else do I need if I wanted to use it for airing up tires or small air tools.

 

Can't quite tell what all is there in those pics, but you'll need the following:

Tank
Compressor
Pressure sender on tank (to signal the compressor to turn off)
Wiring/relay/switch
Quick-disconnect fitting for the tank to hook your air hose up to

 

Tank has a relay box on it to cut the pump off so looks like I have all the basics just need some wiring and a place to mount it