Not only is this a very worthwhile effort, it's a heck of a deal. Besides the elaborate wiring diagram, you get a Glove Box "Breakdown Service Manual", about 10 pages covering most of the questions raised on the list when the car doesn't do right. Fuse locations, relay locations, what to bridge to check this and that, simply an outstanding 'where to turn to' when you have a problem, you won't believe how much is covered. You also get an accident data form, a detailed blank to fill out, just in case, so that you don't forget anything. All the money goes to the Parkinson's research foundation. Price is $10 for a download, $13 for the CD. I ordered the CD but by mistake got the download. The download is zip file, if you don't do zip files, go for the CD, hopefully it's full PDF version. You need Acrobat reader to turn the PDF file into printable form, if you don't have Acrobat reader it's free on the net and easy to find. Bob says sales have been less than exemplary, lets fix that, are we not the mighty DML?