Yes, there's a dimmer. If you turn it up or down, it displays it in the right LCD as ILU-1 to ILU-9.
These gauges are bright because I set the camera to take a 2.5 sec exposure for added brightness.
And yes, I do have a 1600x1200 version.
http://www.redfaktor.com/dump/sti_desktop2.jpg
Enjoy
-Ryan