1. Power up the PFD and wait until the airspeed and altitude tapes are shown.
2. Enter system setup by simultaneously pressing and holding the top left (L1) and third down from the left top (L3) Line Select Keys until the countdown timer in the lower left corner of the display indicates zero.
3. Use the left knob to go to the SystemInfo tab and verify DFC90 Software Part number and revision at the bottom of the screen.
If the software version shown here is 510-00874-000 Rev02 or earlier, it has NOT had the TC/Gyro update.
If the software version shown here is 510-00874-000 Rev03 or later, it HAS had the TC/Gyro update.