Whilst trying to find a user manual for my 32 i encountered a few others for other models of skylines. Might help anyone in need of some informations =) You never know ;P Not to sure if anyone else has posted these on the forum but yeah.... they mostly have diagrams of electrical circuits etc.
R32_All_Engine_Manual.pdf:
http://files.filefront.com//;8325467;;/
R32_GTR_Service_Manual.pdf:
http://files.filefront.com//;8325491;;/
R33_All_Engine_Manual.pdf:
http://files.filefront.com//;8325750;;/
R34_All_Workshop_Manual.pdf:
http://files.filefront.com//;8325742;;/
Enjoy