Hign-concerned Chemical:NONEPlacement on Vehicle:frontCountry/Region of Manufacture:ChinaSpecial Features:52mm gaugeItem Weight:255gBrand Name:ZMFJHOrigin:Mainland ChinaMaterial:Plastic ShellFeature: - High Precision - Racing look enhance the characteristic to your car/vehicle - Fitment : Universal 52mm diameter Voltmeter fit for Motorcycle Car /Truck/ Gasoline Engine (The compatibility just for reference .Please make sure the item fit for your car before purchase.) Fitment: Fit most of 12Volt gasoline vehicle, Fit 2" or 52mm Diameter Gauge Pods holder Application: Color: Black Voltage: DC 12V Diameter: 52mm/2 Material: Plastic Quantity: 1 Set Package Included: as the picture shows 1x Air Fuel Ratio Gauge OR 1x Sensor OR 1x Gauge Cup Note: The gauge cup needs to be purchased separately, the gauge does not contain the gauge cup ! ! O2 sensor instructions - The white line is at heater ab - Black line signal line C, gray line signal ground D - The green wire of the instrument is connected with the black wire of the sensor. - The gray line is connected to the negative pole of the battery. - One white wire connect with the car shell or battery negative pole. Another white wire connect to the ACC line of ignition switch - The white line is the heater and does not distinguish between positive and negative electrodes - About the air fuel gauge, please see the installation instructions. About FQA Q:Are the product photos real? A:Yes,All the photos displayed are 100% real.and photos are all taken by ourself.But maybe there are some color shading because of monitors. Q:How do I pay for my purchase? A:we accept the following payment methods: credit card; money booker, T/T;western union. Q:When the delivery? A:we will send your orders in 1-7 days(according to you order's quantity )after the payment.But in case of any hot products are temporarily out of stock,we will contact you asap to ask an extension or change other items or any of your suggestion. Q:How much does it cost to ship to my country? A:Package less than 2kg will be shipped by China Post Airmail.the item you would like to purchase weighs more than 2kg. You can place the orders separately, making sure each order weighs less than 2kg, to take advantage of free shipping. You can either choose another express carrier, can ship the package via Fedex/DHL/UPS for you package! Q: I am a reseller, I would like to buy many pieces of your item, What's the wholesale price? A:Thanks for your inquiry. if you would like to buy large quantity, please Contact us .we will give you the best price. thanks . Warm Tips Due to hand measure, the size may have 1-2 cm(0.4~0.8'') differs Due to different monitors and lights, 85-98% Similar to the pictures , but there will be little color difference . Due to long shipping, the item may damage in transit, if the item damage, pls contact us immediately first before leave feedback, thanks for your kindly understanding About Feedback 1.If you are satisfied with our products and services,please leave your postive feedback and 5 stars. 2.If you don't satisfied our products,pls contact us before you leave negative feedback. 3.we guarantee we will 100% slove any problem for you and make you satisfied.