TM 9-4310-397-142-2. INDICATORS. - Continuedh.Tachometer. The TACHOMETER (18) indicates engine speed in revolutions per minute (RPM). Operatingrange is 1000 to 2250 RPM. An overspeed switch is built into the tachometer and is normally open. The switch closes ifthe engine speed reach 2350 RPM. This is factory set and not adjustable.i.CompressorAndEngineRestrictionIndicators.The COMPRESSOR (19) and ENGINE RESTRICTIONINDICATORS (20) monitor the air pressure drop through the compressor and engine air cleaner. The red indicator locks-up at maximum restriction with unit running at full load. Press reset after a new air cleaner is installed to restore indicatorto green.2-4
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