We recreated an aircraft with that feature, so the ADF was developed as it is.
But, you can change it for a default one following these steps:
Search the followings lines:
Delete the last one which should be “//gauge18……, and add this one:
gauge18=Bendix_king_radio!Bendix-King Radio ADF, 984,298,288
Save the file and try it.
You should have the 172 default ADF on the 2D panel.
You have to replace the new panel.cfg in the “Panel”, “Panel.1”, “Panel.2” and “Panel.3” folders.