Hi H1-D

Dont have an answer yet, cant recreate your problem.

What OS do you run?  I run XP-Home.

Open FSUIPC.log, in the modules folder, and look for these lines.

DebugStatus=0
............other stuff here    
10250 Module identified = "F16.GAU"
   10250 ModuleOK="F16.GAU"
............other stuff here

Do you have other addon dll's in  your folder that could be conflicting..all default FS9 .dll in the modules folder have a file date of 6/12/2003 9:36pm.   If you do, maybe move the addons to a temp folder and try again.

Delete the FSUIPC.ini,...key, and...log files and start over.

Although the gauge works in both panels, (the one that comes with Viper, 9kb, and the one that comes with the panel, 6kb), I use the latter, as the former is a FPS killer on my system.

Cheers,
Dave