hello. we have a 5600 ford, during winter I replaced the water pump, sending unit and thermostat 160 degree, first started using it today for planting oats, made 3 rounds and the heat guage went right over to the red side, we then checked the radiator, didn't seem to be hot, we then removed the cap and checked the water temperature, it was right a 160 degrees, we continued to plant checking the water temperature , stayed right at 160 degrees, so good we have a bad sending unit or could the instrument cluster have gone bad? and how ould you chech which one it is? the instrument panel worked fine before all of this, I did take it out during winter to repaint the hoods, could a wire mixup be causinf the problem? thanks for help