FIRSTLY HI TO EVERYBODY

I HAVE A MERCEDES C CLASS W203 YEAR 2002. I AM WANTING TO INSTALL A AVIC HD1BT I AM WANTING TO KNOW WHERE TO WIRE THE SPEEDWIRE (VSS) AND THE REVERSE GEAR WIRE IS ON THE CAR, I HAVE FOUND THE REVERSE GEAR WIRE ON THE REAR HEADLAMP DID NOT WANT TO SEND A WIRE ALL THE BACK TO THE BOOT

CAN ANYBODY HELP

THANKS IN ADVANCE FOR ALL YOUR HELP PEOPLE