I am searching for a reasonable cost CGA 540 valve oxygen regulator that will have a CGA 540 to connect to an oxygen bottle w/ 2 guages. 1 to read the oxygen tank pressure, and then a knob to control the pressure to the other valve for the out gas. ideally id like to be able to control it up to 1500 or higher is ok also if anyone knows of one or a part number I can lookup.