ITEM NAME:2" 52mm 7 Color LED Auto Car Tachometer Gauge Meter Pointer Universal Description: High-speed motor, the speed measurement is more accurate, the measuring range is 0~10000 R.P.M. 7 color LED backlight display cool, and red pointer indication. Simple and convenient to install, used to measure the speed. 4 cylinders /6 cylinders/ 8 cylinders -Three types of back can be adjusted Wiring method: red line to ignition switch 12V (+); black line battery (power supply) negative "-"; yellow line to headlight 12V (+);Green line to car speed signal coil. Specification: Instrument type: electrical type (tachometer) Dimensions: 52mm (2 inches) Applicable voltage: 12V Measuring range: (0-10) * 1000RPM LED backlight: 7 color LED backlight Shell color: black Mirror: transparent mirror Applicable models: 12V car racing modification Package Includes: 1 Piece Tachometer 1 Piece Power Cord 1 Piece Manual Note: Please allow 0.5-1 inch difference due to manual measurement.(1 inch=2.54cm) Please check the size measurement and the picture carefully before making.7 color LED backlight display cool, and red pointer indication. LED backlight: 7 color LED backlight. 4 cylinders /6 cylinders/ 8 cylinders -Three types of back can be adjusted. Shell color: black. Applicable models: 12V car racing modification.