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Temp digital gauge is dim most of time, how can I get back to the bright setting

(2004 Buick Park Avenue)
in Sun City West, AZ on July 13, 2013
sometimes it will come back to bright but most of time is dim(with lights on!)
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Popular Answer
on September 10, 2015
Turn the light switch to the left then to the right. Does that control the brightness.
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