CHEVROLET 1999 Corvette - Manual (Page 142)

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Be sure to continue scanning your displays, controls
and driving environment just as you would in a vehicle
without HUD. If you never look at your instrument
panel, you may not see something important, such
as a warning light. Under important warning conditions,
the CHECK GAGES icon will illuminate in the HUD.
View your Driver Information Center (DIC) for
more information. The HUD controls are located to the left of the
steering wheel.