94 Prelude overheating, but nothing hot under the hood. Change Thermostat

already, what next? I have a 94 prelude that i had the engine replaced in back in November. Everything was running fine, but the car would go past the middle point for temp when the car would sit for a while, but then it would go back to the middle point on its own.

Well, last saturday i was on a gravel rd and i peeled out and gravel kicked up and about 5-10 minutes later, i notice the temp gauge was all the way hot. I have changed the thermostat, blead the line, and refilled the coolant and the car gets hot is only about 1 minute. It literally goes from off and cool to all the way hot in about 60-90 seconds. Also, although the temp gauge is all the way hot, the radiator cap, plastic resovoir, no hoses, or the engine is hot. I take the radiator cap off and the coolant is not hot at all.

what is my issue. Please help?