2-11. EXTERNALLY MOUNTED CONTROLS AND INDICATORS
Connected to engine tachometer
HOURMETER: Indicates cumulative
number of engine operating hours.
Connected to engine tachometer drive
and operates only when engine is op-
erating. Records up to 9999.9 hours.
TACHOMETER: Indicates engine speed
in revolutions per minute (rpm).
Each short mark on gage equals 50
rpm; each long mark equals 100 rpm.
AIR CLEANER RESTRICTION INDICATOR
Indicates air cleaner filter ele-
ments require servicing.
Factory set to signal when air
cleaner filter elements require ser-
vicing. Red signal indicator inside
indicator gradually rises as air
flow decreases due to dirt particles
trapped in elements. When red signal
is fully exposed, it is locked in
position. After servicing filter
indicator is reset by
pressing top of indicator.
Permits charging of batteries or
slave starting of engine from an ex-
ternal power source. Also provides a
power source for charging/slaving
+24 volts negative ground available
at this receptacle.