Mods, I vacillated on where to post this. Please move to the electrical or hi-po forums if I guessed wrong.
Click
here for a great tutorial on electric power steering. The attached Hot Rod mag article addresses using a '04-'09 Prius electric set-up. They cover the mechanical and electric pieces of the puzzle along with pictures.
If I wasn't so pigheadly committed to my truck's 6 volt system I'd be all over this mod.
RonR