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S&S Cycle Intelligent Spark Technology Ignition System Sensor Map Sensor 55-1037 catalog FL Duo-Glide (1961) Duo-Glide FLNew Old Stock Part # 55 1037 Intelligent Spark Technology (IST) Ignition System Sensor Map Sensor The S&S system makes use of crank position sensor, cam position sensor if present, MAP sensor, cylinder head temperature sensor and an exclusive knock sensor that detects detonation or knock while the engine runs Knock sensor allows the ECU to automatically adjust ignition timing to eliminate knock whenever it occurs Optimizes power and fuel economy The