The VDO Tachometer displays RPM information received from the VDO AcquaLink® NavBox or the NMEA 2000® data bus and distributes additional engine information to optional 52 mm AcquaLink® EasyLink Gauges. With AcquaLink® Tachometers you may monitor up to 4 boat engines via NMEA 2000® or J1939. Easily assign the dedicated engine to the chosen gauge by using VDO Configuration tool or by connected TFT Display.