If you have any problems， pls message us， we will here for u anytime.Features:100% brand new and high qualityFor All MotorcycleEasy to install & long lasting0-13，000RPM MeasurementSpecification:DC 12VBlack line lock positive electrodeGreen line lock negative electrodeYellow line contacts signalSome models need to attach high voltage signal lineQuantity: 1 pcSize:94*67*57 mmNet weight:225gWeight:255gPackage include:1*Motorcycle Tachometer GaugeJust try， do not be shy.