RL-HM022 Tacho hour meter waterproof,Record max RPM a self powered LCD Hour meter, Tachometer and Maintenance Meter RL-HM022 inductiveTACHO HOUR METER for motorcycle ,snowmobile, ATV,boat TACH/HOUR METERUse for:Motorcycle,ATV,Marine or any gasoline engine 1/2/4 strokeEngine IS NOT Running: Accumulated Run Time(Hours)Engine IS Running: Current RPMEngine Recently Stopped: MAX RPMReset Max RPM: Hold ...