TM 5-3805-262-102-11. EXTERNALLY MOUNTED CONTROLS AND INDICATORSHOURMETER/TACHOMETERConnected to engine tachometerdrive.HOURMETER: Indicates cumulativenumber of engine operating hours.Connected to engine tachometer driveand operates only when engine is op-erating. Records up to 9999.9 hours.TACHOMETER: Indicates engine speedin revolutions per minute (rpm).Each short mark on gage equals 50rpm; each long mark equals 100 rpm.AIR CLEANER RESTRICTION INDICATORIndicates air cleaner filter ele-ments require servicing.Factory set to signal when aircleaner filter elements require ser-vicing. Red signal indicator insideindicator gradually rises as airflow decreases due to dirt particlestrapped in elements. When red signalis fully exposed, it is locked inposition. After servicing filterelements,indicator is reset bypressing top of indicator.SLAVE RECEPTACLEPermits charging of batteries orslave starting of engine from an ex-ternal power source. Also provides apower source for charging/slavingother equipment.+24 volts negative ground availableat this receptacle.2-22
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