I just replaced my radiator this afternoon. The temperature runs between the number 8 and the second (100 degree) mark on the gauge. Tonight, in 70 degree temperatures, the top half of the 8 on the gauge was covered by the arrow. Considering this is a brand new radiator with the apporpriate 82 degree thermostat (which is also new), I'm just going to take it that this is the correct temperature and gauge reading for my car.

Greg
'84 300D