Operator`s manual

INSTRUMENTS AND CONTROLS
73
Tachometer
The tachometer has two colored fields: green and red. Use the green
field for normal driving (1000 to 1600 rpm). Use higher engine speeds
for maximum engine brake performance. Never allow the engine to go
into the red field (greater than 2200 rpm).
To achieve maximum fuel economy, use the Performance Bonus Guide
feature. This feature helps the driver find the most efficient operating
range for the engine. See Performance Bonus Guide for more
information.
Upper Tell-Tales
The Stop, Check and Info message tell-tales are located in the upper
tell-tales box on the instrument cluster. The left and right turn signal
indicators, seat belt tell-tale and parking brake tell-tale are also located
in the upper tell-tales box. Refer to the Driver Information Display
manual for additional information about the message tell-tales.
Speedometer
The speedometer is driven by the vehicle’s electronic system.
Front and Rear Brake System Air Pressure Gauges
The system air gauges are connected to the front and rear circuit tanks
via sensors mounted on the pass-through wall. The two gauges should
register equal air pressure. By observing the gauge pointers, the
operator can detect a pressure drop if an air leak develops and can
readily identify the circuit affected.
Failure to observe these precautions can result in
the loss of braking performance. This can lead to a
vehicle accident, which can result in personal
injury or death.
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