85MM Marine Tachometer Gauge for NMEA2000 J1939 Protocol with Water Temp Oil Pressure Voltage Display DC9 32V White Dial for Boat Yacht RV Features： 1、4 in 1: The boat tachometer integrates the monitoring functions of water temperature, oil pressure, RPM, and voltage, providing real time data for all these key parameters. 2、Instant Display: The tachometer allows you to visually see the numerical values of water temperature, oil pressure, RPM, and voltage, enabling real time understanding of the boat's condition. 3、Warning Function: Tacho meter has warning function that alerts you when any parameter exceeds the safe range, prompting users to take necessary measures for repair or adjustment. 4、Enhanced Boat Performance: By providing real time monitoring and warnings for vital parameters, this meter helps you maintain optimal boat performance. 5、Easy Installation: Digital tachometer is designed for easy installation, making it convenient for boat owners to set up and use, ensuring a hassle free installation process. Specification： Item Type: Tachometer Material: ABS + Stainless Steel Working Voltage: DC9-32V Installation Size: Approx. 85mm/3.35in Function Display: Water temperature, oil pressure, RPM, voltage Application: Applicable to RVs, yachts, fishing boats, ships Package List： 1 x Tachometer 1 x Manual