[jimhurtt]

Thanks for the info and comparisons on the location of the sending unit for the coolant temperature gauge. It is interesting the different replies and other answers I have gotten to this question. I guess there would be no difference if your sending unit reads the coolant after the thermostat or before, unless your thermostat stuck in the closed position. I installed a new thermostat, that if it sticks, is supposed to stick in the open position as my sending unit is after the thermostat. I have looked for a chrome water neck for my 302 (where the top radiator hose and thermostat come out of the intake manifold) but none are threaded for the sending unit on top like mine. So I don't know where my water neck came from. Good idea on controlling your fans DV. Mine come on and stay on with the ignition switch.