New S600 Owner - question about engine temp

Anyway it's 23 degrees F here and I drove the car for over an hour - the engine temp needle did not break 80 degrees. Is this normal? It just seems super low to me.
Question 2 - assuming the needle/gauge is broken - if the car begins to overheat, will the dummy light come on, or does that just read whatever the needle shows?
Off to look for new rims!
Thanks,
Erik


