I do not understand why GM thought it was a good idea to scale the coolant temperature gauge like this. There is no way you can look at it and figure out what the temperature is unless you are good at doing odd fractions in your head really fast. All you know it is somewhere between two numbers. Why?
They did it just to annoy you, Brian.
The margin of error on that gauge is so wide that it does not matter. They should have made an idiot lamp like Ford did with their oil pressure gauges. But you would complain about that, too.
I say screw the facelift. Replace all the gauges.