Attention:the gauge pointer will not be the zero when you first time get it , it is the normal , after the gauge connect the power, it will point into the ZERO52mm Turbo Boost Gauge -30~30 PSI 12V Universal Car Boost Pointer Meter Vacuum Water Temp Oil Temp Oil Pressure GaugeSpecification:- It is suitable for 12 volt gasoline vehiclestachometer is only suitable for1~8 cylinder carspointer display, cost effective gauge. Tachometer:0~8x1000RPM Boost Guage PSI:0~30In.Hg-0~30PSI Boost Guage Bar: -1~2Bar Water Temp Gauge: 40~120 Oil Temp Gauge: 50~150 Oil Press Gauge :0~100 PSI Voltmeter: 8~16VPackage Included:1 * GaugeNote: The gauge holder needs to be purchased separately, the Gauge does not contain the gauge holder Wholesale and Drop shipping- For wholesale, we will offer the discount or free express shipping which only takes 3-7 days to arrive. - For drop shipping, We could send the goods to your customers directly and won t leave information about us if youd like to.1. Boost gauge PSIFeatures: - Used to measure the turbo of automobile. - Numbers and pointing clearly show the turbo boost. - Blue light on the dial for easy reading in the darkness. - High sensitivity and easy operation. - Measurement Range: -30~30PSI - Power: 12V DC - Note: When the red-pointer stop running, please take out the LED bulb from the rear, and turn the red-pointer around for several times with a thin iron wire, then check it. Package including: 1 * Boost Gauge 1 * PVC Hose 1 * T-Fitting