Allow me to answer my own first (noob) question.
Apparently oil temp and cylinder head are 2 separate sensors. And we don't have a gauge for the cylinder head temp sensor, just oil temp.
So, that begs the second question - since we apparently can't rely too much on the oil temp gauge to tell us how hot our engines really are/if we're within a "safe" operating temp, how can we truly tell if our heads are getting too hot?