Features a resettable timer and service modes that flash service messages at 5, 10, and 20 hours of operation. Provides real-time tachometer reading up to 20k rpm and records max rpm. It keeps track of total accumulated time for maintenance on oil changes, valves, and spark plugs. Includes a log book. Usable with any gas engine, it connects to the spark plug wire (no batteries needed) and is encased in 100% epoxy. Can be attached via peel-and-stick or with enclosed hardware.