55fanatic

Im going to be installing a Pioneer Avic N1 soon in my 2000 ML55(production july of 2000). My question is When I go to tag my VSS(Vehicle Speed Sense) wire, is it already behind the radio because of the MCS navi unit? I know for other MLs with out Navigation this is different.

Also would there be a connection for the Reverse light in there as well or am I going to have to go to the drivers side kick panel and test all the wires in the main harness that runs to the rear of the car?