You will be ****ed if you spend money on that and think that you will end up with something useable...
If need be, save up and get a Xenarc. Sure, it cost a butt load, but you will have to look your monitor EVERY time you get in your car. You will be a lot happier in the long run if you take it step-by-step.
When I first joined the site I wondered why a lot of the people had indicators in their sig that showed the status of their project... Well, I have been putting my system together for the last 6 months and still haven't put it in the car. Maybe I am slow... I like to think that I am just taking my time
PS - gotta love those 3rd gens