Controls and Instruments
39
An audible alert signal also informs the driver of
low oil pressure. Refer to Safety Features and
Equipment chapter for table of audible alerts.
CAUTION
Loss of oil pressure may cause severe engine
damage. If low oil pressure LED illuminates,
park the vehicle safely and stop the engine
immediately. Request service assistance.
Engine Coolant Temperature
06231
Indicates the operating
temperature of the engine
coolant. The normal reading
should be between 190°F and
222°F (88°C to 106°C).
A high coolant temperature indicator LED (bot-
tom right corner of gauge) illuminates when the
coolant temperature rises above 223°F (106
°
C).
An audible alert signal also informs the driver of
this condition. Refer to Safety Features and
Equipment chapter for table of audible alerts.
Turbo Boost Pressure
06230
Indicates turbo boost pressure
in psi. Reading depends on
engine rpm and load
conditions.
Tachometer
06221
Indicates the operating
speed of the engine in
hundreds of revolutions per
minute (rpm x 100). The
tachometer serves as a
guide for gear shifting and
helps to prevent engine
over-speeding when driving
downhill with the JACOBS
engine brake operating.
The maximum allowed
engine speed is 2,450 rpm.
Speedometer
06222
Indicates the vehicle
speed in miles per hour
(mph) and kilometers per
hour (km/h). The digital
odometer records the
distance traveled in miles
or in kilometers (units are
driver selectable).
Voltmeter (24-Volt System)
06224
Indicates the condition of the
24-volt electrical system. With
the engine running, the
normal reading should be
between 26.5 and 28.0 volts.
Fuel level
06225
Indicates the amount of fuel
remaining in the fuel tank.
A telltale light illuminates
when about 12 US gallons (45
liters) of fuel remain in the fuel
tank.
CAUTION
Operating the vehicle when the reading is
below 1/8 full is not recommended.
Accessories Air Pressure
06226
Indicates the accessories air
system pressure. The normal
operating pressure is from 95
to 125 psi (655 to 860 kPa).
Primary System Air Pressure (Rear)
06228
Indicates the primary air
system pressure. The normal
operating pressure is from 95
to 125 psi (655 to 860 kPa).
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