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Diameter: 2"/52mm, Power: DC(10-15V) 12V Professional. Red LED light, Read Range: 0 to 9999 RPM, Red warning light will light up when tacho reach over 6000 RPM Stable characteristics, high reliability, High accuracy, easy operation, you can use it conveniently. Universal fit for most of cars or motors with 2" or 52mm Diameter holder