Is this normal for temperature range?

Griffin two-row aluminum radiator with a Mark VIII fan. Temperature readings based on new Autometer electric water temp gauge installed last week:

City driving: 180
City idle: 200 before fan kicks in, then down to 180
Highway: 170

I don't know what thermostat I have, so I'm going to assume stock 190. How does this sound? Am I too hot, and if so, where should I look first?

Edit - this is for the '88 GT