Just purchased a 35 S welder and the gas line blew off at the regulator. I re-installed, this time with a clamp and then the other end blew off the solenoid end. I noticed that the gauge needle is buried and that's even with the knob turned all the way out. I figure the gauge is bad or am I adjusting it the wrong way. If the gauge is bad, where do I purchase a new one and what is the general setting of the gauge, for mig welding. Thanks, Tom