Searon Go Kart Hour Meter Tachometer for 4 Stroke 2P1R Gas Small Engines RC Toys PWC ATV Motorcycles Marine Engines Chain Saws Tractors, Boat Generator Lawnmowers Digital Tach Hour Meter Tachometer for 4 Stroke (2 Plug 1 Revolution) Gasoline Engine Hours display from 0-99,999.9 with 0.1 hours resolution Tachometer display from 0-30,600 RPMs with 30 RPMs resolution Internal CR2430 battery with 5 years service lifetime, so no external power connection required Dustproof / waterproof level: IP68.