I am thinking it's pretty solid that I have the wrong NSS switch in there, because I've seen the inside of the transmission (and thus the shift lever) when I was reconditioning it. Since the only real difference between 69+ NSS is 1- or 3-pin and thus the part that touches the switch (rooster comb seems to be the same), I really think it's the switch. How would I go about re-routing the reverse light circuit? It seems easier to get a 1-pin NSS switch and reroute the reverse light circuit than to replace the shift lever and valve body.