DRIVING ENVIRONMENT
OVERVIEW OF INSTRUMENTS
Gauge Layout
1
Tachometer
The tachometer displays the
engine's revolutions per minute
(RPMs).
2
Speedometer
Indicates the speed of the vehicle.
The speedometer is driven by the
vehicle's electronic system.
3
Coolant Temperature Gauge
The coolant temperature gauge
indicates engine coolant
temperature. The normal operating
temperature for Mack engines is 80
to 105° C (176 - 220° F). If the
temperature remains below or
exceeds the normal temperature
range, the cooling system should be
checked for problems by an
authorized Mack truck dealer. When
coolant temperature is excessive,
the red STOP tell-tale will come on
and the buzzer will sound. The
engine is at risk and the ECM may
derate the engine power. Stop at the
rst safe place where the problem
can be checked.
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