Installation method:use doule side taps,peel and apply to the baof the meter and mount.for more permanent application use template to locate mounting holes.DO not into tanks or engine crankcase.Mounting will determine sensitivity of the meter,In most applications the appropriate mounting sensitivity can be easily achieved. to e it more balancely to get more sensitivity.Features:1.Replacable battery,battery type: CR2032.2.Time display mode is optional.it is divided into hour system and minute system.For example,hour system 123.4,it means 123.4 hours equals 123 hours 24 minutes;And 123:06,it means123 hours and 6 minutes equals 123.1 hours.Short pre on to switch the display mode.3.In order to avoid the machine g nsported in the way of and invalid ion, or other invalid timing,you can shut down hour meter by preing on 3 seconds,until display''off''.and start timing by preing on until display show''on''.4.Auto sleep,if there is no iginition signal, and no preing on.it will auto sleep in 5 minutes to save the battery.when a ignition signal is received,it will wake up automatically.5.If you want to reset,please remove the battery and wait for 5 minutes before putting it in.When the battery is running out of power,and you want to save the current data.Please try to put a new battery in within 2 minutes after you remove it.Specification: and high quality.the service life of vehicle-oil changs, valve, adjustments, spark plugs, etc.Easy to install.Peel and stick,connect to spark plug wire easily.Battery replacabable, battery type:CR2032.Works on Any Engine.Record and display to 9,999.9 hours.Hour gla symbol appears and fes on/off to indicate counting time.Automatic roll over.Resolution: 0.1 hour.100% epoxy encapsulated casing resists water, shock, stand fire of 85°C.