Airlines Indicated Airspeed Pitot Tube 
Pilot's Life Blog
APRIL 9, 2024
In short, an airspeed indicator measures the ram pressure and compares it to static pressure to determine how fast a plane is moving. Moving air from outside feeds into the pitot tubes and fills a pressure diaphragm. True airspeed (TAS) is the difference between the indicated airspeed and actual speed.
AeroSavvy
OCTOBER 26, 2020
The Honeywell SI-800 Airspeed/Mach Indicator has been a standard instrument on the Boeing 737, 747, 757, and 767 for decades. Boeing stopped installing the stand-alone indicator in favor of modern, reliable flat panel displays. Digital Data Airspeed The Indicated Airspeed (above 30 knots) is displayed in a digital format.
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