I bought another Compressor for sandblasting my old Cat iron before it is painted. It is an Ingersoll Gyro Flo w/4-53 Detroit. Is there anyone here on the forum who has had experience with one of these old compressors? This one is pressuring up to 185 lbs and blowing the relief. I replaced a small regulator that is supposed to go to the idle control that operates the unloader. But it still over pressures the system.