The flow gauge on the front can be set to limit the amount to 3.5 LPM etc. It is NOT the PSI adjustment.
For some machines a service manual can be found on the net. While for other brands they are not listed.
Pressure can be checked at the output by using a 0 to 15 PSI air gauge that is oxygen safe. Most machines put out 5 PSI or 8.5 to 10 PSI. There are some larger units that are specifically designed for lampwork that will do more. The first test would be to determine what the actual output pressure is. Then if not correct, adjust to the manufacture recommended settings.
Machines of different designs will have their overall output pressure setting value located internally as you have stated. The adjustment is simple, once the valve is located. Perhaps someone with direct experience with your model of machine can assist.
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