Why Liquid filled in Pressure gauge&Why Plug in Top side?

This video explain about purpose of liquid filled PG (pressure gauge) and use of Vent system.
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What is a pressure gauge?
A pressure gauge is a device that measures pressure in a compressed gas or liquid.
Why have your gauge liquid filled?
The liquid fill inside the gauges head acts as damping for the moving parts. As a result, any damage caused by vibration, pulsation and general wear and tear can be prevented.
Why are there yellow levers on the pressure gauge casing?
For pressure ranges under 363 psi (25 bar), gauges tend to have something called a filling plug. These plugs come with small yellow levers which are closed when delivered. You must ensure you open these when fitting so that pressure does not build up in the case. This pressure causes unacceptable high accuracy deviations for the gauge.
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