I have the Haynes manual for the 240Z, 260Z, and 280Z. I don't like the wiring diagrams they have in there, they're so small that you can barely make out what the words are and it's too easy to be following one wire and cross over onto another one. The 240Z diagrams aren't so bad because they're pretty simple, but good luck trying to read anything in the 260Z ones. It is a pretty old manual, I don't know if they would have upgraded it though.