I have a '07 4runner that has the single disc cdplayer audio system installed. I am fortunate to have the Original Toyota GPS Navigation in dash head unit with voice command. It is made by "Fujitsu Ten". The OE model part number is 86120-35241. I want to install this in my 4runner but have been told that I need to purchase the wiring harness (part no. 82141-35a31) for $1800.00 to make it work. There has to be some other way to do this. Anyone who has installed navigation in their 4runner please help. Any other ideas or options would be appreciated. I have searched the forums but not found a solution yet. Thanks!!