He didn't specifically say the display would be mounted in the dash, although he implied it.

My point is that if he doesn't have room in the dash just because he wants a CD player up there, well then he should just dump the CD player because he'll never use it once he gets his empeg loaded with tunes. But playing movies is something that the empeg doesn't do, so he's got a valid point if that's his reason. Even if we disagree on the safety or utiliy of watching DVDs in the dash, it's still valid to say that he can't fit both, so he needs to make his own choices.