Let's revive this again. Four things to comment on -
1. The rev counter has a red-line - right? So when it's back-lit in red how on earth are you supposed to know where the red-line is? Imagine hiring a diesel to someone who thinks it's a petrol engine, and it's dark!
2. The audio works with the key in the 'AUX' position, but the steering wheel controls only work with the ignition on.
3. Is the audio not lit when it's on? Only seems to be back-lit when the lights are on.
4. For those people with a whistling driver's wing mirror. Try sealing the gap between the cover and the mirror itself. Cured mine!