I'll have to see if I kept all the pages, You need pinouts of the stock radio plug, and the new nav unit which has a different connection, (20 pin) and a new 20 pin connector to wire into the harnes, then you need to locate the VSS wire, as well as the backup light lead. I used the stock analog 99 amp, but some of the Toyota Navs require the JBL amp (digital) So anyone attempting this should make sure the get the right Nav unit. I also added the backup camera and Toyota XM module which displays the xm stations on the nav.
I will say it has been well worth the hassle, I've taken several road trips since, and just last week was poking around on backroads in the Smokey Mountain area without fear of getting lost.
I know there are alot of good aftermarket units out, but I like the fact that its an OEM Toyota piece, and matches the illumination of the rest of the dash.