The MSP679 is a magnetic speed pickup sensor with a 3-inch (76 mm) thread length and military-style connector. It generates an electrical frequency proportional to engine speed and operates without needing an external energizing circuit. The sensor is commonly used with GAC’s electronic speed controllers. It is built for durability with a stainless-steel body and can function in temperatures ranging from -65°F to 255°F (-54°C to 107°C).