Which chapter of part catalogue has to be consulted for P/N of Mach air speed indicator? I only found Mach warning module, I can not found the indicator!?
Aircraft with liquid crystal or CRT displays have the airspeed indication in the top display (usually left side). The standby altimeter/airspeed indicator is the only other source of airspeed indication.
I'll see if I can get you a pick of a 767 top display for reference.