78 INSTRUMENTS AND CONTROLS
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.
DANGER
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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