Just to see what you are talking about I downloaded and installed an Airbus 340. The panel that came with this plane was incomplete, in that it was missing some key components as well as the entire Gauges folder.
I went and downloaded an Airbus 340 replacement panel by Hector Molinas from:
http://www.simviation.com/fs2004panels1.htmI installed the panel and the fix. It worked like a dream. Including the GPS!!
Just follow the install directions in Hector's Readme.txt file and you can't go wrong.
Go get it!!