Ok guys, just thinking of alternate ways to wire up the rear foglight without cutting, splicing or damaging the stock harness in any way..
I came across this;
CURT TRAILER HITCH WIRING T-CONNECTOR 55362 NISSAN - eBay (item 300433835937 end time Mar-29-11 15:32:30 PDT)
Basically it goes between your connections of your stock harness to work trailer lights, plug and play. I would have to modify it a bit, but I think it would work fine for making the rear fog work.
Now they do make them for Altima, Maxima, Murano, Sentra, so what would be compatible with our Z's..
Or I could just buy a wire tap and be done with it....