• Works on all gasoline engines. • No battery or ground wire required. • Easy Installation - No wiring necessary. Peel & stick, or attach with enclosed hardware. • 100% epoxy encapsulated cases are water resistant. • Record & display in increments of 0.1 hours up to 9,999.9 hours. • Hourglass symbols appear & flash on/off to indicate counting time. • Automatic roll-over. • Displays can be read at all times (whether power is applied or not)! • No clicking like mechanical meters. • Simple patented one wire wrap installation. • Log book included. • Real Time reading of tach up to 20,000 RPM’s. • Records max RPM and is re-settable. • Total hours accumulated - not re-settable or erasable. • Adjustable inputs for dual or single spark ignition systems. Easily set with a touch of a button.