Ok, update. Put the pickup coil in a water reservoir, heated the water while watching the resistance across the leads. Started out at 601 ohms at cold tapwater temp, went open circuit (infinity) by about 130 degrees F. I say about 130F because while the water was hot, I could hold my fingertip in the water somewhat comfortably. Pulled the sensor out, dumped cold water on it and immediately went back to 600ish ohms. I have to assume since the alternator is wet immersing the sensor in water to test shouldn't hurt it..........
