Just updated the files on Patreon:
All panel modules have been updated to use the "BRT0_Ctrl" parameter for instrument brightness control (the previously used parameter was deprecated). You can assign it as usual to a SimVimCockpit input to control SimVimPanel instrument brightness. The options for SimVimPanel brightness control will be expanded in the future.
You'll need to re-download your panel module to make use of this brightness control parameter for it.
See this page for more info on lighting.