Heres what i wrote in another thread (and then some)
zerothread?id=426543
Theres one. Have you checked the race bred one out? And yeah check Carl Hs out. I've heard there are 8 different variations for the rb20 harness. I didnt see mine out there either. You have to piecemeal it together from different guides thats what i found...
I also used some info from this one:
http://www.nissansilvia.com/fo...d503b
Theres only three or four wires you need to hook up to get running fully on the upper harness. Only two of which are on the big grey oval KA clip. Another from the RB is the white/purple, which goes to the THICK white wire coming outta the KA fuse box. The last is the fuel pump relay which is black/pink (dig around near the main harness clip on the RB to find it, its not on the main part) to black/pink KA on the small brown clip. I just pulled mine tonight ill go check the wires and post up in here.
Now OP the ONLY wire you need to be concerned about with regards to the fuse box is the THICK white wire thats going into it. Splice (or "tee") the white/purple one into that. Its pretty obvious which one it is.
Wiring in the RB20 is not hard. You just need to take your time and research research research.
Good luck.