On my regulator I have the right side gauge set to about 20-30psi. I think most people set it around this area. There is also info about setting up the MA957 regulator here http://www.plantedtank.net/forums/planted-tank-faq/18272-milwaukee-ma-957-co2-regulator-instuctions.htmlOn my milwalkee regulator there are two round cirlces. The one at left guages how much is in the tank, the one at right guages how much psi I'm pushing through the solenoid? What should that read? Right now mine is at 8 PSI. Thanks for you help!