Keep up with the strict maintenance schedules for oil, valves, air filters, and more required by late model four stroke engines with this re-settable hour meter with tachometer from Hardline Products. All functions count down showing you balance of time before scheduled service. Each function is re-settable by holding down the button when the service function that is due is flashing, or you can reset each service function at your own interval. Flash alerts include "clean air filter" every 5 hours; "change oil" every 10 hours; and "valve service" every 20 hours. Preset service intervals can not be changed or re-programed. This also meter includes a Resettable Tachometer with adjustable input and a trip meter mode to track running sessions. It works on any gas engine up to two cylinders and 16, 000 RPM, and it can be used with fuel injection engines. It comes with a log book so you can write down oil changes, valve service, chassis lubrication, clutch service and suspension setting notes in one convenient place. No power is required the meter has a 10-year battery sealed inside. The unit measures 2-1/8 x 1-1/2 x 5/8 inches. Hardline Products is an industry leader in after-market power sports accessories, offering matched registration letter and number kits, decal application and removal fluid, and more for on- and off-road motorcycles, boating, personal watercraft, all terrain vehicles (ATVs), snowmobiles, and karting.