ICE Navigation Wire Question?

[duck]

I'm installing a navigation setup and I need to know where the VSS (Vehicle Speed Sensor) wire is. This wire tells the navigation how fast I'm going.

I looked at several wiring diagrams, but couldn't find it. It was described as a violet/white wire, but I could not find such a wire where it said to look. Does anyone know for sure where this cable is on the INSIDE of the car?
I'd rather not have to go around to the ECU, which is under the hood.

Thanks! Any help is appreciated. I've seen a ton of ICE/Navigation threads so I'm really hoping someone knows where this wire is.


Bonus Question: Where can I tap the Reverse wire, so I don't have to run a line all the way to the reverse lights in the back so the navigation knows when I'm going backwards.


PS: the car is a 2007 sedan.