http://avic411.com/forum/viewtopic.php?t=1298
I sold the car and put the stock radio back in and bought a 2004 R32 in great shape. Of course the Z1 was the first thing I changed in the car. Install was a little different as fat as the speed pulse wire goes. It's a different color but, still behind the insturment cluster.
Other than that, everything hooked up the same way.
Here's a pic of the final install:

And here's the car it's installed in:
