6 Gauge set included: 120KPH Speedometer, 8000RPM Tachometer, Fuel, Water temp, Volt, Oil pressure Speedometer and tachometer: Panel color:Black Backlight Color: Red Fixing dimension: 85mm(3-3/8″) Working voltage:932VDC Suitable for car truck boats off-roadvehicles boats This speedometer with left and right turn signals and high beam This tacho must be hooked up to the “W terminal on vehicle alternator. Many diesel engines and most inboard gas boat engine alternator have this connection. It can also be working with tachometer sender Minor gauges: Install Diameter: 52mm/(2-1/16) Oil: 10184ohms, 0-145PSI (0-10Bar) Fuel: 240-33ohms, E – F(If you need other output signals, like 10-180ohms, 0-90ohms ect, Leave me a note while you paid) Temp: 287.422.4 ohms, 100-250F(40-120C).