Just finished fitting my Alpine NVE N099P navigation system with an Alpine Touch panel TME M770 screen. This system amazing. It took me about a day to fit it. It has several advantages over the standard Lexus navigation such as the touch control and also the TMC traffic alert system. I noticed how quick it is compared to my older Alpine INA N333R i used to have in my last car. The routing of the wiring was the hardest part. I have mounted the screen in a TRD dash tray. It is always open and on show unfortunatly. I wish steve audio would sell me one of his motorized ones. The navigation computer is in the boot. The screen and the navigation get their swiched power supply from behind the cigarette lighter, the permanent power supply was taken direct from the battery f or the navigation unit. The scrren only needs a switched supply. The handbrake cables on both units were grounded so all operations are possible even when driving. The speed signal was taken from behind the speedo (white wire with blue stripe). I was told you can pick it up in the footwells but despite searching I couldnt find it there. Anyway behind the speedo was quite easy to locate. I have the GPS antenna placed on the rear parcel shelf, I was worried it might not work there due to the heated screen but after testing it I was recieving full signal.