Press [T] and type at the console:

 show throttle     Shows throttle
 show mach         Shows speed in mach
 show velocity     Shows speed of air
 show groundspeed  Shows speed on ground
 show fuel         Shows fuel usage
 show fuel usage   Shows fuel usage in percent
 show altitude     Shows altitude in feet
 show AOA          ?
 blackout          Blackouts ON/OFF
 flameout          Flameouts ON/OFF
 flatspin          Flatspins ON/OFF