How air speed indicator is modified as mach meter?

An airspeed indicator can be modified into a Mach meter by integrating a pressure sensor that measures static pressure and dynamic pressure to calculate the aircraft's true airspeed. The Mach meter then converts this airspeed into a Mach number, which is the ratio of the aircraft's speed to the speed of sound at the current altitude and temperature. This conversion requires adjustments for variations in air density and temperature, ensuring accurate readings across different flight conditions. Typically, Mach meters have a dial or digital display that shows the Mach number instead of airspeed in knots or miles per hour.