On the dash display... since you're not yet familiar with all the acronyms, lol... and a couple of these guys helping drive Buicks...

The display on top of the radio and A/C control stack in the center of the dash facing the driver is called the DIC (Driver Information Center) on a 99 GTP. The one on top of the dash facing the sky is called the HUD (Head-Up Display) and it projects onto the windshield, if so equipped. The DIC is an LCD (Liquid Crystal Display) with a dark lens over it. When that display is dim, the bulbs that backlight the dark lens so you can see the LCD have gone out. Theres 3 or 4 maybe and they are funny looking but parts stores have them. Take the dash bezel off and the DIC can be easily popped out for bulb replacement, then you'll be able to see the DIC at all times. Makes the car feel like less of a POS if that works right.

Carry on with the other issues