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As I stated in my comments, I found best access to the wire aways away from the harness. At such point in the wire bundle, I found it by coloring, which was unique.
I'm lame. I've been meaning to update the instructions to include the '06-'08 models but never got around to it. Last weekend I took some photos of the wiring piece and hope to do the shelf removal process this weekend.
The '06-'08 wiring is actually easier than the earlier cars, here's the pictures to show you where to connect for the tach wire.