AEM's Air Inlet Temperature Sensor Kits (AIT) are affordable and accurate. They are available in two NPT sizes and include weatherproof mating connectors, pins, and a mounting bung.
30-2014: Air Temp Sensor with 1/8" NPT Male Thread, High-Performance DTM-Style Connector, Aluminum Bung, Connector & Pins
30-2010: Air Temp Sensor with 3/8' NPT Male Thread, Aluminum Bung, Connector & Pins