Digital Tachometer for monitor the speed of marine ... 32V 2.0~9999 RPM 3.diesel engine meter Digital Tachometer for monitor the speed of marine diesel engine. Every ... take a look.1.A micro-computer/computer/contract tachometer, designed to be used with ships, automobiles and ... temperture, water temperature, voltage, time and time record) Digital Tachometer for monitor the speed of marine diesel engine 0~ ...