New Blue Shell 85mm Waterproof Boat Tacho Sensor Marine Tachometer with Hourmeter 3000 4000 6000 8000 RPM Tachometer 12V/24VNew Blue Shell 85mm Waterproof Boat Tacho Sensor Marine Tachometer with Hourmeter 3000 4000 6000 8000 RPM Tachometer 12V 24V Note The sensor needs to be purchased separately, the tachometer does not include a sensor, please know, thank you Package 1 1X Tachometer 1X Instruction Package 2 1X RPM Sensor The sensor needs to be purchased separately, the tachometer does not include a sensor, please know, thank you Feature: * 316L stainless steel for long