The Nissan Path

I have a Kenwood nav unit with 7 inch screen and was thinking of installing it but I need to pick up a speed pulse for the mapping to work. Has anyone information on the location of a wire that give this, the wire color would be a great help. Also does the wire need to be programmed live, I have had this problem on Mercs and have had to have the dealer activate the pulse via a laptop.

If it is a big job I will just keep using my TomTom
thanks

im not sure if you are done with this one since its been posted last 2010. im here to ask for your help too. im encountering the same problem now. im looking for my pickup accessories - speed sensor and for help on how to install it.