2 Gauge Set 85mm GPS Speedometer 0-120MPH Fuel/Volt & 85mm Tacho/Temp/Oil Press. 2 Gauge Set 85mm GPS Speedometer 0-120MPH Fuel Gauge Volt Tachometer 0-8000RPM 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. CX8308 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. Input parameter(The sensor will be not included). 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. If needed the temp and oil pressure sensor, this is the link. Oil pressure sensor: 1/8 NPT 10Bar. Water temp sensor: 1/8 NPT. 1 x 85mm 3 in 1 GPS Speedometer. 1 x 85mm 3 in 1 Tachometer Gauge. 2 x Installation Instruction.