I am looking to install an alpine nav system in my ML. its a 2002, and i already have the cva1005 monitor installed. I'm having problems finding out what is necessary to install the nav. A lot of the car stereo places around here tell me I need the alpine speed pulse generator, since there is no available vss wire. I was told by others that what i need is a CAN bus adapter instead, which costs just as much and appears to be only available in europe. Then some other people told me that they can install it without any of those things and it will work fine. Depending on who I got a hold of at Alpine, they gave me different answers as well. Any help would be greatly appreciated.