It shuts down immediatly...no dieseling. I think the newly rebuilt motor is still very tight. I'll back down the timing to 6 degrees BTDC and see what that does and run it a while to let the motor loosen up. As far as the temp sender...I've got the gauge type in right now...waiting on a correct single prong unit. With this sender hooked up, my idot light comes on slightly. The engine still runs like a stipped ape. It burped about a half gallon out of the overflow hose.