The best bet is to go to Bentleypublishers.com. They produce service manuals for VW and theirs is about the best manual you will be able to get.It has a lot of testing data, such as voltage amounts for sensors to help diagnose problems and procedures.
You should also consider joining a free forum called vwvortex. It is devoted to cars built be VW and is separated into models. You car would be in the B3 & B4 forum for all things except the engine. The engine would be in the 16 valve forum. There is a lot of info and help available there as well. They will expect that you own a Bentley manual and have gone through it to no avail when you post a problem.
Hope this helps.
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