I did not use the videos when I did my harness. Rather, I used his instruction on his website.
http://www.lt1swap.com/2004vortec_pcm.htm
Here is a link as it is hard to find on the website. The instruction were/are invaluable both for rewiring and also future diagnostics. I printed it off in color and made hand written notes along the way. Now it is MY new service manual suppliment. I refer back to it often.