Anyone know how to do this or is there a harness or something that I can get?

 

Ground the parking brake wire. Some of the newer units don't allow you to ground them. However if you look online there are some hacks to bypass it.

 

depends on the unit. pioneers you have to do a little splicing, nothing any basic electronics shop can't handle

typically yes thoguh, ground parking wire

 

This is the factory navi system

 

there should be a wire connected to your ebrake under the center consle, if you remove that wire and get a Good ground the video will play if not you have to run a manule switch in between the wire that you can flip to confuse the radio to think the ebrake is set.