Spec, these monitors only have a VGA input so forget about the VCR as a tuner thing.
The point I made that while these big monitors have a fairly poor dot-pitch for everyday PC use, it's just fine for HDTV and games, especially a Dreamcast with a VGA box. These are real monitors, not just a TV tube with a VGA input. They can do 800*600/60Hz, which means it can handle 480p/1080i HDTV input, which is excellent.
I have a similar setup, and I feed my 2nd big monitor with my WinTV-HD, my Geforce MX dual VGA (mostly for DVD), and a Dreamcast with a VGA box (you haven't lived untill you've seen Shenmue in VGA big-screen glory).