Al - I know this is available on the Honda Civic Hybrid II (as I own one) and there is a button next to the steering wheel for the normal instrument light brightness and then the Nav screen has a setting for the brightness as well which is separate from the instrument light brightness.

--> Averaged 685 miles/week and 49.0 mpg in first year (35.7k miles from Aug 7, 2006 to Aug 7, 2007)