but make sure to give an answer that feels right when they poke your wrist.

Feels right to whom? A 1, maybe 2, is probably how I'd rate it if I was trying to be honest unless they're seriously stressing it without a warning. In which point, I'd just be totally confused how to rate it, but they could probably get a decent idea about the discomfort from my reaction.

Or feels right for the injury I assume I have? Should I just guess what other people would say or lookup values on the way to the ER?

Or go somewhere in the middle so it's not so obvious I'm lying about experiencing pain when I look like I'm not really in pain?