Description: New and High Quality Case Material: Iron Size: Diameter 52 mm, High 28 mm LED Display: Red (1), Yellow (1), Green (8) Connection Description: Black wire connect to the positive supply (+ 12V) Green Wire connect to the negative power supply (-12V) Yellow wire connect to the sensor Installation 1. Black +12V connect Power Positive 2. Green -12V connect Power Negative 3. Yellow Wire connect Oil can Sensor(must not connect with the original test wire, or this Fuel Gauge is inaccuracy) Important: Green means the display of LED has a red / yellow / 8 green Blue is the indication that the LED has a red / yellow / 8 blue This product must be used with the oil capacity sensor (that is, oil float) Attention: Red wire function: It is adjustable resistance for oil adjusting, do not need to use it at normal circumstances, if the oil amount is not display accurate, the red wire can be used to adjust the oil amount. Note: This product must be used together with oil sensor (namely, oil floater) This product not have waterproof functions The item can use for Car,Motorcycle or by your need Connection mode 1.Black Wire :Positive electrode 2.Green Wire:It is important to note that the signal line must be pulled directly from the oil buoy and cut off the line originally connected to the instrument assembly.Otherwise,the oil meter is absolutely inaccurate 3.Yellow Wire:Connected sensor Adjustment mode 1.And the positive and negative power lines must be well connected.Connect the yellow signal line to the sensor. 2.Fill up the fuel,turn on the power supply,and then slowly adjust the potentionmeter with a screwdriver so that all 10LED lights have just turned on 3.After adgusting the first time you have to pay attention to observation,no oil when a few lights,if there is a light to re-adjust the detection so that all the lights just went out. Package Including: 1x Car Fuel Gauge