Help- wiring rear view mirror tem/compus lights

H E L P : I have a 2008 GT convertible I would like to add a rear view mirror with temp/compass and lights. Can someone tell me colors of wires:
12 v key on/
12 v constant
hot lead from door switch?
If there are connectors already wired in, location would be a great help also.
Thanks srj jj4051@aol.com