After market head unit

I am hopefully installing a new head unit and powered sub this weekend. I was just wondering if you have to do any special wiring to keep the back up cam feature in the rearview mirror. I can't seem to find an answer for my specific question.
Thanks in advance!

 

Nope, the wiring goes through the roof, not in the dash, so it went show up on the head unit without extra rewiring, but you also can't mess up the mirror camera doing a new head unit.

 

Yeah buddy...

 

Thank you. I thought about it afterwords that the wiring goes through the top but I decided to keep the post up just to be sure