2 Gauge Set 85mm GPS Speedometer 0-120MPH/Fuel/Volt/Tacho/Oil/Temp with Senders. 2 Gauge Set With Senders 85mm GPS Speedometer 0-120MPH Fuel Gauge Volt Tachometer 0-6000RPM Water Temp? Oil Press PSI. The water temperature gauge, Oil pressure gauge does not support desktop testing. It is necessary to connect the SENDING UNITS in order to use it properly. Any helps, please do not hesitate to contact me. RPM Tachometer Support : Car /Truck/ Boat /Diesel Generator Engine /Gasoline Engine. 316 Stainless steel bezel with curved glass. Convenient Installation by multi-plug socket connecting way. With curved glass(with anti-fog function). 7 colors baclight for your choose red (default)? Green? Blue? White? Yellow? Cyan? Purple? (automatic), customers can adjust any color that you like. Tachometer fit for Car /Truck/ Boat /Diesel Generator Engine /Gasoline Engine. CX8307B GPS Speedometer Specification. Fuel level: 0-190ohms, 240-33ohms, 10-180ohms, 0-90ohms(Can be adjusted). Backlight :7 Color backlight. Engine hours: 0.0-99999.9H. Oil pressure sensor: 10184ohms. 1 Black: Ground(-). 2 Red: 9-32vDC(+). 3 Blue:PRM signal. 5 White: Oil pressure signal. 6 Brown:Temperature signal. 1 Black : Ground(-). 2 Red : 932vDc(+). 3 Blue : Fuel signal. 5 White : High Beam. 6 Brown: Buzzer alarm(+). 8 Yellow: Left Turn. 9 Gray: Right Turn. 10 white: External Button. 1 x 85mm 3 in 1 GPS Speedometer. 1 x 85mm 3 in 1 Tachometer Gauge. 1 x Tacho Sensor. 1 x 1/8NPT Temp sensor. 1 x 1/8NPT Pressure sensor. 2 x Installation Instruction.