Originally Posted by KiwiJochen

You can do this much easier:

Reverse signal: take it from the reverse light in the taillight cluster, it is right behind the nav location. Tap into the reverse light wire.
It is the same as the reverse signal from the LCM, except for the rare occasions when reversing with a trailer attached, and with the original trailer wiring control unit fitted (because then the reverse light is turned off)

Wheel pulse: if you have EDC, then take it from the EDC control unit behind the battery. With no EDC, you can use the averaged wheel pulse (slightly less accurate but works) from the radio module, right beside the nav

This way all the work is in the boot, you don't have to run any wires to the front of the car at all.