*Major Editage*
Ok so its been forever since I scanned this little bundle of paper, and I've long paid for the scanner i bought to do it, plus a few beers [thanks guys and girls] Therefore it is now free, and kindly being hosted by Nedge_2k and 30psi [kudos to them]
280ish MB, including the fold out wiring schematic in the back. Covers UK/Euro models, but may have relevant info for the ROW.
Links:
https://docs.google.com/file/d/0B7cG...it?usp=sharing (Updated: 06/2013)
http://yourcarphotos.co.uk/S12/Nissan Silvia (S12).zip
UPDATE 2019:
http://nedge2k.com/files/s12_silvia_manual.pdf
Enjoy =)