Figure 1-20. Instrument Panel
f. Instruments. The Instrument Panel includes all gages that provide the operator with information about vehicle
condition and operating status. The speedometer (1, Figure 1-20) receives electrical input from the WTEC II Vehicle
Interface Module (VIM) on vehicles equipped with WTEC II transmission controls. The speedometer receives electrical
input from the WTEC III transmission ECU on vehicles equipped with WTEC III transmission controls. The WTEC II VIM
and the WTEC III transmission ECU are both located behind the kick panel. Tachometer (2) input is provided by the
engine speed sensor located on the engine flywheel housing. The fuel gage (3), oil pressure gage (4), water
temperature gage (5), FRONT BRAKE AIR pressure gage (6), REAR BRAKE AIR pressure gage (7), and VOLTS gage
(8) receive electrical signals from sending units. The sending units respond to changes in fluid level, pressure,
temperature, and DC correct and send this information to the gages.
g. Indicator Lights and Alarms. The lighted indicator display (9) and audible alarm (10), located on the instrument
panel assembly, are activated by switches located in various systems. These include, but are not limited to; master
stop, low engine oil pressure, low air pressure, high water temperature, fan off, and high transmission oil temperature.
When any of these switches are activated, they energize the proper indicator and/or alarm, alerting the operator of a
potential problem or condition which needs to be monitored.