Pressure Indicator is any instrument that indicates pressure. Pressure Gauge is also a type of pressure Indicator. It is a mechanical device. Pressure indicators can work on mechanical deflection (in case of pressure gauge) or Piezo electric effect, change in capacitance, change in inductance etc. These are generally digital type instruments.
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A pressure gauge indicates actual pressure and a differential pressure gauge indicates the difference in pressure.
The difference in pressure between absolute and gauge pressure.
A compound pressure gauge measures both positive and negative pressure in a system. Positive pressure is the pressure above atmospheric pressure, while negative pressure is the pressure below atmospheric pressure. This type of gauge is commonly used in applications where both types of pressure need to be monitored, such as in HVAC systems or industrial processes.
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Well, darling, pressure gauges don't give a hoot about altitude when it comes to calibration. They just want to be accurate wherever they are. So yes, pressure gauges do need to be calibrated for altitude because atmospheric pressure changes with altitude, and if you want reliable readings, you better make sure that gauge is properly calibrated.