Neecooler Hour Meter DC 10V-80V Mechanical Hourmeter Gauge [SYS-1 ]for Boat Car Motorcross Diesel Motor Truck Engine The meter has a positive and a negative lead for easy installation, can be operated within a wide voltage range The timer operates on in put voltages from 10 to 80 Volts DC((typically 12 VDC, but you could use on 24 and 36/48 VDC). The timer has a 6 digit display with the least significant digit being 1/10 hour (99999.9), it is super accurate and reliable timing accuracy with error under 1. Widely used for tracking time on machinery such as Fork lifts, buses, trucks, golf carts,boats, cars,tractors or any other device where time is used to determine oil change intervals It is widely used for tracking engine hours and will allow you to keep track of engine hours so you can monitor service intervals.30-Day money back and 1-Year warranty