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Old 05-13-2020, 12:05 PM   #4
PnCRedJwl2SS
Howdy! Pete here...
 
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Drives: 2017 50th Anniv 2SS, A8, NPP, MRC
Join Date: Jul 2009
Location: Schertz, TX
Posts: 1,382
I believe HUD brightness setting is manually adjustable only.

It is on my car, at least.
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PnCRedJwl2SS
2017 50th Anniversary Edition, A8, NPP, MRC, w/Sunroof and Glow-tie!
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Ordered from GM
Delivered to dealership and home 9-16-16
This car is a beast!
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