Indeed the Meyers 200D is a FSX native aircraft, it never had any FS9 version before. And as you guessed, the GPS unit on the top left is fake

Concerning the VOR adjustment, I believe this might be linked to a problem in the gauge declaration in the panel.cfg, I'll have to investigate about this.
Concerning the AA-5B, there are two versions. The first one was a FS9 version, but then came an upgrade that made it a real FSX native aircraft, not a port-over. It had a separate interior model, and self-shadows for example. I'm glad you sorted the gauge problem, I believe this should be described in the readme of that plane... Anyways, this is one of my favorite GA aircrafts. If I can find it again, I'll send you a link to a cool repaint for it (I don't like the default repaint on that one).