i took mine apart today and the bulbs are for the backlighting. my suspicion is that there is either a wire missing in the harness for the 98's that otherwise lights the DIC perf shift, or...i just have a bad DIC.
If anyone has their digital DIC out on their 99+ S/C'd GP (where the Performance shift works), could you tell me if there are wires in the A5, A8, or B10 pin slots. I'm largely suspecting A5 as a missing wire on the 98s that would allow the perf shift to display. if you do have a wire in that slot, could you trace it and tell me where it leads to? I realize that is a ton of work, but I would greatly appreciate the help.
Here is a diagram of the DIC plug pin positions and what they mean (thanks to backinblack) :
