Interesting question. Thinking about the pressure gauge, a standard bourdon tube gauge relies on a force inside of the bourdon tube trying to straighten it out. It relies on a pressure differential between the system it is attached to, and the outside air.
If the pressure gauge and the entire closed loop system is put into a pressure tank and raised to 100 psi in the pressure tank, and the closed loop system the gauge is attached to is open to the pressure in the tank, there would be no movement of the gauge. If you seal that closed loop system and add pressure, or draw it away, then yes, the gauge would move. Consequently, if at 100 psi pressure tank pressure, then the closed loop system to the gauge is sealed, reducing/elevating the tank pressure will cause a pressure differential between the closed loop system and the tank, which will yield movement to the gauge needle.
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