Where should the temperature gauge be registering at normal operating temperature?

It is running a bit over half way. I have replaced both head gaskets, the radiator, the water pump, thermostat, and temperature sensor. I checked the cooling fans and they seem to be working fine. I have flushed the coolant system three times with prestone flush and removed block drain and refilled with fresh antifreeze, distilled water, and a corrosion inhibitor. It builds up pressure on radiator hoses quickly upon a cold start, but I have checked for bubbles in the coolant and there are none. It's about 80 degrees outside and after a short drive the engine seems quite hot to me. Is this normal?