Chevrolet 2007 Corvette Owner's Manual page 176

Be sure to continue scanning the displays,
controls and driving environment just as you would
in a vehicle without HUD. If you never look at
your instrument panel cluster, you may miss
something important, such as a warning light.
Under important warning conditions, the CHECK
GAGES warning will illuminate in the HUD.
View your Driver Information Center (DIC) for
more information.
176
To adjust the HUD so you can see it properly,
do the following:
1. Start the engine and press the HUD
dimmer control all the way up by pressing
the (+) button.
The brightness of the HUD image is
determined by the light conditions in the
direction the vehicle is facing and where you
have the HUD dimmer control set. If you are
facing a dark object or a heavily shaded area,
your HUD may anticipate that you are entering
a dark area and may begin to dim.
The HUD controls are
located to the left of the
steering wheel.