Picked up a cheap in-dash double-din DVD player from Walmart online. Something cheap and something I won't miss if it gets stolen. Heck I think my Kenwood headunit is better just because of the integrated iPod control. Anyways, I was prepping for the install and it's pretty straight-forward, but I need some advice on the brake-line wire.

From my research, all I need to do is to ground that wire. Should I ground it to the chassis or should I ground it into the harness' ground and what do I do with the ground wire from the headunit (do I ground that to the chassis)?

Thanks in advance.