WOW!
I had no idea this was about a CR's harness and a neutral switch!
Like Jack says,
IT'S ALREADY IN THERE!
Find the small grey plug plug coming off the steering column harness with only two wires - 126/121. Extend these wires to the neutral safety switch on the transmission and your done!
Don't know which plug on the transmission is the neutral safety switch? Buy a cheap dwell meter with an audible tone for continuity. Touch the probes to the two brass pins on the tranny, with the tranny in neutral. Nothing should happen, put the tranny in gear and you will hear the tone.
That simple
DV...Plug it in and bring that baby to the Fling!