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Diameter: 2"/52mm, Power: DC(10-15V) 12V Professional. Red LED light, Read Range: -30 to +30 Psi, With 1/8" NPT Sensor Red warning light will light up when boost reach over 21 Psi 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