Navigation equipment, radios, autopilot, auto-throttle, multiple engines with multiple parameters to be controlled, multiple hydraulic systems, pressurization and environmental controls.
Consider that for each jet engine you have different displays for RPMs, temperatures, oil pressure. Things add up fast.
replyModern airliners do away with most dedicated instrumentation (a few critical ones such as airspeed, compass heading, and altitude might still have analog backups) and use a few screens to display all of this. Computers monitor most of the parameters and issue alerts when anything is out of normal.
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