I have just purchased a 1975 coupe this car has been completly rebuilt however I have a concern with the way the coolant gauge goes. When I am driving down the road at 110kmh/ 70 mph the gauge goes very close to the hot area about a needle width from it. in town and in heavy traffic the car runs at 200. There is a new waterpump and 180 degree thermostat in the car. Is this normal for a car of this year?