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The part # of the sensor that I am using is Bosch #11025. Sensors develop there own voltage. This is a single wire sensor and works good if installed near port, 12 to16 inches. If the sensor is farther from the port, then it doesn't get hot enough to generate voltage. In that case a 3 wire sensor would work best. The 3 wire uses a 12 volt source to get heat. Bill