an extra screen in my car?

I have this in my car already



and I just bought this today



I have harness number 1 already, but I am missing harness number 2. My question is do I need #2 to run this extra screen or is #1 going to support it?




Thanks guys

 

number 1 is the OUTPUT. number 2 is the INPUT. number 1 is all you need to send the video source to other monitors.

 

Thank you so much, but then what is the purpose of harness #2?

What if I want to play my i pod or cd through my main unit (I know I need a second DVD player to do the following) and have a video playing on my other monitors?

How do I do that?

Thanks.

 

the input is for a reverse camera and another video source (ipod or dvd player). if you only have 2 video inputs you can get a normal video switching device from a home theater dept.