When you drive a Prius (like me), and you always have your lights on (like me), you probably have been irritated by the dimmed speedometer and unreadable display in bright sunlight (like me). If you didn’t read the owners manual (like me), you also probably didn’t know about this trick to get the brightness back (like me). Here’s how:
You need to do this every time you start the car or turn on/off the lights. Return to a dimmed dashboard while driving by pressing the brightness selector briefly.