CX9 7-pin tow harness installation question

chuyler1

goes to eleven
:
2013 CX-9
I used the OEM harness to get brakes and turn signals. I ran two wires up to the front of the vehicle, one for +12v and another for the brake controller. I grounded to the frame (not the OEM harness). Last part is the reverse lights. Anyone know where I can easily tap into the reverse lights without pulling apart the entire car?
 
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