(And while we're at it, why am I having so much trouble embedding an image?)
I'm reading "monitor" as "speaker," which is what they look like. If that's what they are, then presumably, they're there so the contestants can hear exactly what Wink is saying.
I feel more than a little silly assuming that a monitor from 1980 would look like a tiny flatscreen from the 2010s. On a serious note if those are indeed speakers how much lag time would there be from when Wink says something and when the contestants hear it? I never heard any feedback or lag, and it never seemed like the contestants waited an extra beat or two to hear something.