I'm about to purchase a PCM for 99 GTP along with a pre-01 shift knob. Anyone have any details for installation?

Thanks!

If you don't have a 99 GTP, I wouldn't use that PCM in your vehicle... The one you already have has both the normal and performance tables in it, its just you never access them both w/o a perf shift button. Search around, its an easy install, just have to connect the button to your PCM.

It's actually a modded ZZP pcm. They said it "should" work with the shift knob that has the perf shift button on it.

Did you get my pm back?
If not, I have installed a switch to turn the Perf Shift on/off.
Basically you just wire in a switch inline with the wire from the PCM pin #21 I believe and the other end from the switch goes to a ground.

PM sent.