So i have a 97 mustang v6 the temp gauge is all the way over on hot. After I drive for about 30 miles it will go to a random place in the normal range, however as soon as i start up the car it pegs again. I've done a coolant flush, changed both of the coolant sensors and the tstat. Where do i go next? could it be a bad ground wire? Seems like the readings from the multimeter into the sensors dont make much sense they are all over the place. However visual inspection of the wires looks fine? Im lost. I dont want to pull the gauge cluster unless i have too. Thanks