Did the evaporust procedure sunday and yesterday. It definitely cleaned the cooling system and it's running cooler too, but of course the weather has been cooler also. Went back with green coolant and a pint of rust and scale inhibitor. Although Scott didn't specify it I refilled and drained the block and radiator with plain water first to rinse out all the evaporust. I'm almost certain my gauge is reading high. It went almost to the top of the normal range before the thermostat opened and it backed down to a hair past middle ways. I'm running a rally instrument cluster and the top of normal is about 230 degrees. Since I was able to stick my finger in the fill neck without scalding it at the time I doubt if it was anywhere near 230. I may try another temp sender and see if it changes.