2002 Xterra Reverse wire location, etc

I am installing a Kenwood 6019, KNA-G510, and bluetooth unit.

Need to locate the Reverse wire for connection to the G510.

Would like recommendation for connection to ACC wire.

Also, any advice on GPS and Nav Traffic antenna install is desired (though I've had two conflicted tech support calls about needed both the XM Nav/Traffic and included GPS antenna being required at the same time.  One says yes, one says the Nav/Traffic antenna will do everything and the orignal antenna is not required).

Finally, any tips on installation of system components overal would be appreciated. 

Thank you.