Mercury - SmartCraft Sensor Conversion Kit Gen II 75-115 HP 889250K01. Overview. Older mechanical four-strokes run strong, but their factory sensors weren't designed for modern SmartCraft displays. The Mercury 889250K01 SmartCraft Sensor Conversion Kit bridges that gap. It gives Gen II 1.7L engines the sensor package they need so SmartCraft gauges can read trim, temperature, and other key data the way they're supposed to. Once installed, the helm feels more up to date, and the information on the