Ok, some background. I purchased ths pump a long time ago. They still have them on ebay http://cgi.ebay.com/12v-1-5-gal-air-compressor-Puma-6-50-Ship_W0QQitemZ180022942095QQihZ008QQcategoryZ11751QQssPageNameZWDVWQQrdZ1QQcmdZViewItem So, about a year ago, I decided to take off the pressure cut off switch and wire the air compressor through a relay, and controlled by a rocker switch in the cab. So, I would leave the regulator plumbed into the air line, and just have the compressor running when I need the air, and just have the excess bleed out into the engine compartment (I have it mounted under the hood [now] with remote air resovoirs [future]) Well, after I have already wired it to the relay, I am having second thoughts. I am going to use this to supply air for my ARBs mainly, but also to run air tools if needed. I was thinking that if I turned the compressor off while offroading locked, and the air bleeds down without my noticing (I have an air gauge easilly seen), the ARBs could unlock while in use, and I dont want that. So now, Im thinking about wiring that switch back into the mix, but I want to be able to turn it off electrically with a rocker switch regardless of pressure. So, I took it apart over a year ago, and I dont realy remember how it works. I have pictures... In the picture of the regulator portion, I had left a screw loose so I knew what one to reattach it to if I wanted, but I forget if it was the positive or negative wire (the compressor has the customary red/black wires). The screwdriver is pointing to that particular screw. I am using the standard 4-pin style box relays. How would one go by wiring this. Thanks for the help guys and sorry for the long read. Just wanted to put the info out there.