Is this system any good or even woth it? I have an in-dash tv allready so I'll just be adding it to that should I get it or buy gauges?

 

It's cool, but it loses it's appeal real fast. It is not a very economical solution for gauges, after you buy all necessary harnesses and sensors you will have spent far more than a set of analog gauges. It also sucks having to look down at your screen to see your gauges. Otherwise it's a kind of neat gadget to have, just not really practical.