I have the Pioneer 6400CD Head Unit installed and I really enjoy it with the XM tuner. I just got my Pioneer AVIC90-DVD Navigation unit and I am reading the install manual. Looks pretty simple. I am going to put it under the back seat. Two things I am unsure of. First, where to get power for it. I have never installed anything that I had to tap into power for. How do I do it and what tools do I need? Second and even more difficult for me, it says I have to connect it to the speedo cable somewhere. I have no clue what, where, when or how about this one. Any adivce and or pics would be greatly appreciated. I wanted to get a pro to install it, but the only local shop wanted $2,000 for the unit installed and would not install it if I bought one from EBay like I did. I got it for $1,100, so I could not justify $900 for installation. Thanks everyone.