Suspension Air Pressure Gauge
A suspension air pressure gauge (Fig. 3.44) registers
the air pressure applied to the vehicle air
suspension.
Tachometer
The tachometer or rev counter indicates engine
speed in revolutions per minute (rpm) and serves as
a guide for shifting the transmission and keeping the
engine in the appropriate rpm range. The tachometer
has only one unit of measurement, 0-2500 rpm. For
low idle and rated rpm, consult your vehicle’s engine
identification plate. See
Fig. 3.45.
Transmission Fluid Temperature
Gauge
The transmission fluid temperature gauge, (Fig. 3.46)
measures the transmission lubricant operating tem-
perature. Temperatures vary by application, but the
transmission fluid temperature gauge reading should
not exceed 250°F (121°C).
NOTICE
A sudden increase in transmission fluid tempera-
ture that is not caused by a load increase may
indicate mechanical failure. Bring the vehicle to a
safe stop and investigate the cause to prevent
f61178208/16/2019
Fig. 3.43, Analog Speedometer - ICUC
f61146810/31/2016
Fig. 3.44, Suspension Air Pressure Gauge
f61178301/02/2020
Fig. 3.45, Analog Tachometer - ICUC
f61138310/31/2016
Fig. 3.46, Transmission Fluid Temperature Gauge
Instruments
3.24
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