Sorry about taking so long. I finally got it figured out.
The 2000 Grand Prix is different. The cable that locks the shifter when the key is off, the 2000 Grand Prix does not have that. At all. It is all electric controlled, and if you unplug it, it does not reneder it inoperative like the older car.
The older car has 2 cables and 2 wires going to the shifter. The newer car has 1 cable and 5 wires.
Anyways. I did some creative thinking and figured that if I did not hook up those 2 wires at all, the interlock would most likely NOT engauge. I wired it up so that the other 3 wires were connected (transmission positino, hot in run, and brake lock). That did the trick.
with just those 3 wires, it works like the stock Cutlass Supreme. When the key is off, the shifter is locked. When the key is ON, you have to press the brake to unlock it.
I did a vid of it working. Excuse the mess, but I am going to redo the wiring. I just used the quick splices and shit because if it did not work, I was going to take it all back out. I was also out of solder.
Here is a vid. You can also hear the BOSE radio. LOL