Umm, in general arcade monitors have RGB, sync + ground video or a VGA plug. Never seen one with anything other than those two (well, except the black and white ones, which have either a big square plug that has ALL the connections on it, or is just a modded black and white tv set).
What looks like a component in on it might actually be something completely different.
Try it with your VCR or old Atari before you try hooking your computer up to it.
Unless you are looking at a game with a projection screen monitor, in which case it might have some other connections.