I decided I wanted onboard air so I pondered ideas to do the task cheap but very effective. I found an A/C compressor from a 1999 Kenworth(York style). I completed the whole installation succesfully off my own ideas only to find complete instructions on the tech article page. Surprisingly enough my ideas followed theirs almost to a "T". My compressor is plumbed to a 10 gallon tank and at an idle will shut off @ 125psi in one minute, five seconds. And no I'm not bragging just have self pride.