Don't know anything about the IT manuals except they are just a shadow of JD books. The JD tec manual for this thing is a inch and a half thick. Back when I got my 950 as a restoration project, I looked for the JD books on ebay and bought all 3. ( operators manual, parts manual, tec manual ) Think I ended up with all 3 for under $100. Have been into most sections of the tractor, all the info was there in most cases. I have to say JD does a great job of supplying parts for these things, mine is a 85, 28 years old. Parts aren't cheap though. Wireing on these things are very basic, if the IT manual has the diagram, it won't take you much time to figure it out. One thing to watch for is dirty connectors and bad grounds. ( clean every connector before fixing anything ) Mine is just about ready to sell this spring, someone will get a good tractor, restoring this thing worked out to be a great winter project when weather drove me indoors. Hope you enjoy yours.
Chris