Which display is used to show cockpit pressure altitude and differential pressure?

The correct choice illustrates an understanding of the specific functionalities of aircraft display systems. The Alternate Engine Data Display (AEDD) is designed to provide critical information about the engine's performance parameters, including cockpit pressure altitude and differential pressure. This information is vital for pilots to assess engine operation and make informed decisions during flight.

The focus of the AEDD on engine data makes it uniquely suited to display these essential measurements, differentiating it from other displays that may not specifically emphasize engine performance or pressure levels. In contrast, the Main Engine Display often encompasses broader operational data beyond just pressure readings, while the Primary Flight Display focuses on essential flight information such as altitude, airspeed, and attitude but does not provide detailed engine-specific metrics. The Cockpit Instrument Panel serves as a more general interface housing various instruments, without being specialized for any one type of data.

Thus, the AEDD is the designated choice for monitoring cockpit pressure altitude and differential pressure, showcasing its critical role in flight safety and performance management.