Ok I thought I'd bump this thread instead of making a new one. I went ahead and purchased that ECU harness that you suggested Schmoo and it works great.

I just have a question for anyone who might of done this conversion. When I put fuel in my car it sputters and bogs a little bit then runs fine. Also when I hit 6500 rpms the rpm needle bugs out like in a GT4 video. I'm mean it looks pretty cool, I was curious to why this might be happening. So much for shifting right before hitting the rev limiter.