The main FSX.cfg is located in the FSX root directory. In windows exploree, just click on the FSX directory, and the cfg will show up in the right along with the the other files and folders.
***DON'T DO THIS UNTIL SOMEONE ELSE CONFIRMS ITS ONE WHY TO FIX THE PROBLEM!!*******
Delete the entire .cfg file. IIRC, it will be rebuilt the next time you start FSX.
****AGAIN, DON'T DO THIS UNTIL SOMEONE ELSE VERIFIES THIS WILL REBUILD YOUR .CFG!!!!!******
But I'm a little confused by your wording (which would be another reason for caution, since I may not know what you mean exactly), and that is why missing guages would mean having to do anything with missing guages. Just reload the add-on. Also, the guages are in ther own folder in the FSX root directory, and again, why would that mean you'd have to mess with the .cfg?
(How do you lose a guage anyway? They are usually screwed in! ;) )
For the jetways or airbridge, I believe that would be Ctrl+J. You also must be parked properly. You can try that and it won't damage anything if I'm wrong.
