I had a Saab 9-3 with Black Panel; it was awesome and I loved it. Basically when you pressed the Black Panel button on the dash every light inside the car and o

I had a Saab 9-3 with Black Panel; it was awesome and I loved it. Basically when you pressed the Black Panel button on the dash every light inside the car and on the dash went out, except for the speedometer, and that only displayed the 'cake slice' with the needle in it (in approx 30mph slices). If you increased your speed into the next slice then that came on as well. If something like a low-fuel warning happened, then that light would come on as required. IIRC the radio controls stayed illuminated as well. It made for an amazingly immersive zero-distractions driving experience when driving country roads at night. That Saab made 210k miles, a good part of the three-times-to-the-moon distance I've driven throughout my life.