N/A On board Regulator Pressure and Tank Fill Pressure Question

Some do better than others. Some key factors are the seat size, geometry, and surface quality. This thread may be of interest:

That's what a "reg" is, it regulates. If it's set for 2500 you'll get a regulated flow of 2500 ONLY until tank pressure gets to 2500. For it to work there must be 2500psi or ABOVE in tank. It WILL still stay at 2500 if tank is at 4500. (In theory)

Regulators are sensitive to tank pressure. They are not proportional, and will stay close to the set point as the pressure increases towards the maximum they can take, but they are likely to run a little higher at the very high pressures - not massively so, but enough to notice; maybe up to a hundred psi or so, depending on the reg.

That is why we strive to tune the gun such (aka "on the knee") that it does not vary much in output as the regulator pressure varies.

Exactly what nervoustrig said. Some do much better than others. I think it is best to set your regulator pressure when the tank is closer to full rather than closer to the reg pressure you want.

CanMike said:

Thanks for the reply guys.

Also the gauge on regulator actually is not a regulator gauge but measures the pressure in the plenum, correct?

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That depends entirely on how your gun is made. If it has two guages, then one gauge will be for the air tank fill pressure and the other gauge will be for the plenum (which will be showing what the regulator is set at).