Don't forget that with the A/C off the fan(s) don't start in low until 224 degrees, near the "1 o'clock" line.
The gauge is sort of tailored to fool you (average owner) in that the 12 o'clock line covers from 190 degrees to 210+: Modern vehicle owners are scared silly when a gauge actually moves in time to engine functions, so the makers damp the movement to practically zero. Imagine the warranty screams if Maggie Jane could see her oil pressure actually vary from (hot) 16 psi at idle to ~50 psi on the road.
Click on the pic and scroll in. The approximate temps were done by one of our members a couple of years ago and were created by allowing the car to heat up with the radiator covered. It's a good guide, though. If you want the dead-nuts truth, go to
www.scangauge.com. (Backordered 2 weeks.)