Table 2-4. Instrument Panel and Controls (Continued)
Twin Agent 4x4 Firefighting Truck
(Refer to Figure 2-4)
Control or Indicator
The Tachometer is used to measure engine revolutions per
minute in the hundredths (0 to 40 rpm).
Oil Pressure Gauge
The Oil Pressure Gauge indicates the pressure at which oil is
being delivered to the various parts of the engine requiring
The Voltmeter indicates the charging system voltage.
Wiper/Washer Control Knob
The Wiper/Washer Control Knob activates the windshield
wipers to remove debris and rain from the windshield.
To activate the wipers, pull the knob outward or turn the knob
To activate the washers , press the knob to spray solutions
on the windshield. Turn the wipers to clean the windshield.