Ocean Link J1939 4,000 RPM 3-3/8 85mm 12/24V Master Tachometer. VDO Ocean Link is a J1939 CAN Bus solution designed specifically for marine environments. IP67 water protection, dual lenses and corrosion proof housing ensure extreme service life, while Ocean Links plug-n-play software make set-up simple and fast. Features Diameter 3-3/8 . Diameter Metric 85mm. Connection Integrated Waterproof Connector Harness. Dial Scale Single. Input Type CAN. Mounting Hardware Spin-Lok. Voltage 12V VDO Ocean Link is a J1939 CAN Bus solution designed specifically for marine environments. IP67 water Diameter 3-3/8 . Diameter Metric 85mm Connection Integrated Waterproof Connector Harness. Dial Scale Single Input Type CAN. Mounting Hardware Spin-Lok Voltage 12V