fuel pressure indicator

instantaneous vertical speed indicator / instantaneous vertical-speed indicator (IVSI)

gas pressure indicator

heat-resistant pressure indicator

heat-resistant vibration-proof pressure indicator

fuel level indicator

fuel remaining indicator

fuel quantity indicator

fuel pressure gage

fuel supply pressure

pressure fuel(l)ing coupling

Proton Exchange Membrane Fuel Cell (PEM fuel cell, PEMFC)

air-flow indicator

artificial horizon (gyro horizon/ attitude indicator)

desiccant indicator

gyro course indicator

indicator console

indicator lamp

indicator light

indicator system

performance indicator

radiac computer-indicator

range height indicator (RHI) scope

target indicator

telltale indicator

turbine inlet temperature indicator

vertical gyro indicator

vertical scale indicator

counter indicator

gyroscope course indicator scale

zone-beat indicator

fire extinguishing system indicator disc

slave indicator