In my rush to wire the terminals I started unscrewing what I thought was the ground. Quickly realized it wasn't and was tied to the unloader. So now I need to readjust it. I operate some big industrial compressors at work so the operation isn't totally foreign to me, but I'm not sure exactly how they implemented this pressure/unloader switch and how best to adjust it safely. I did not touch the pressure adjustment. As I understand it, at max pressure the pressure switch shuts off the power (screw marked P) and the unloader is opened to vent compressor pressure (screw marked J)? I'm assuming there must be check valve int he fitting I marked in the pic so it just vents the comp. What should I be looking for at each stage of operation to know the unloader is at the right adjustment? How does the screw direction change the unloader operation?