You'll have to change them all (including intrument pack) if you go to blue then the whole thing will look like at the end of this video, if you replace only the ATC with blue and the IP remains stock it will look like sh*t and be aware that the leds are brighter than the normal bulbs
 
Thanks, food for thought. I've noticed the illumination isn't working in the on/off, auto, screen & recirculate buttons the rest is ok so might just use genuine.
 

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