A friend, Sergey Dronyaev in Moscow, who reported an issue that he found the Autopilot Heading Bug on the A2A Cessna Shared HDG FIP gauge didn’t synchronize with the one in the virtual cockpit.  I had my head scratched since it was the first time I heard about the issue regarding the gauge.

Sergey later submitted a solution he found from the A2A forum:  Pressing the AP button once (Autopilot on/off) – both gauges will synchronize accordingly.

Just in case someone encounters the same issue, above tip should help.