2" 52mm tachometer fit for 4 6 8 gasoline cylinder,warning exceed 5000 rpm, power supply voltage range: dc 10v-15v Quick-glance & easy to read digital display, self-calibration at startup ensures that the gauge is performing optimally Unlimited use: You can install our tachometer Gauge on cars, boats, motorcycles, trucks and other vehicles Equipped with blue led lights and tinted lens, cool and bright, and watch more clearly in night and bad whether Package includes: Tachometer Gauge,Wiring Harness, Mounting Hardware and Instruction. Simple setting: long press the button to enter the setting mode; Short press to adjust the number of cylinders 4/6/8, after you adjust to the number of cylinders you need, do not need to do any operation, stand for about 3 seconds will exit the setting mode, the setting is complete. < b >Packing specification:< /b >< br > < br > Name: 2"" 52mm Digital Tachometer< br > < br > Applicable cylinders: 4/6/8 cylinders< br > < br > Material: Plastic shell +LED screen< br > < br > Color: Black< br > < br > Operating voltage: 10-15V< br > < br > The package includes:< br > Tachometer *1;< br > Wiring Harness*1;< br > Mounting Hardware;< br > Instruction.< br > < br > < b >What are the advantages of MAIMEIMI Digital Tachometer?< /b >< br > < br > 1. Simple installation: the red line is connected to the positive electrode, the black line is connected to the negative electrode, and the green line is connected to the conductor of the speed sensor.< br > < br > 2.Simple setting: long press the button to enter the setting mode; Short press to adjust the number of cylinders 4/6/8, after you adjust to the number of cylinders you need, do not need to do any operation, stand for about 3 seconds will exit the setting mode, the setting is complete.< br > (Please note: you will find that the number can be increased from 1 to 8 when you set it, but the Tachometer works best for 4/6/8 cylinders.)< br > < br > 3. Suitable for a variety of vehicles: MAIMEIMI tachometer is suitable for a variety of vehicles, including cars, boats, motorcycles, trucks, etc.< br > < br >