Pressure Gauge Jumping/Bouncing around

[Chris_Ely]

How close is the gauge to the compressor?
If it is close to it, it will read varying pressure when the compressor is on. This is an artifact of how the compressor works. To fix this, just move the gauge farther away from the compressor. You may want to do the same with the pressure switch.

[Mr V]

That is normal, no need to worry or do anything about it.

[rich2202]

That's why I have my team place the gauge/switch after the air tank (air physically passes through the air tank). The air tank acts like a damper, and smooths out the pressure.