I've gone through a lot of effort to try and clearly lay out all the necessary info pertaining to the electrical wiring situation facing anyone doing an VH45DE engine swap.
This spreadsheet pinpoints the key connectors that need to be spliced together to work in a 300ZX.

http://dl.dropbox.com/u/11596240/91%20I ... inout.xlsx

DISCLAIMER: I have yet to actually do the wiring and cannot back up this document with proven results. There were a few wires that were not clear to me and I would appreciate anyone who has knowledge regarding this matter or has done this swap already, if they would review the cells labeled with question marks (?) and verify if they are correct. Thank you. Also, I'm sorry, but the hyperlinks will probably only work on my computer.

This is GREAT info and needs to be stuck!

Do you mind if I repost??

Updated Dropbox Link:
https://www.dropbox.com/s/d6ywnhz7n7o8l ... .xlsx?dl=0