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TM 10-3930-623-12
1-43. The oil pressure sending unit is connected into the
1-45.  INSTRUMENT PANEL (See figure 1-12).  The
pressure side of the lubricating oil system.  This unit
instrument panel assembly incorporates the usual
contains a coil, the resistance of which varies with
standard instruments in a compact group. The engine
pressure.  Actuating current to the instrument passes
operation hourmeter is used to determine when periodic
through this resistance coil which varies the current, and
service operations are due. in addition to controlling the
thus the indication, in proportion to the pressure on the
ignition system, the ignition switch energizes the
sending unit.
instruments, and the starter circuit up to the starter
button.  The light switch operates the spot light and
1-44. The water temperature sending unit is threaded
taillight.
into the engine cylinder head to sense and respond to
engine coolant temperature.
This unit contains a
1-46. The fuses in the fuse holder protect the various
temperature sensitive resistance coil which regulates the
electrical circuits of the truck.  Refer to the wiring
flow of actuating current to the engine temperature gage
diagram (figure 1-11) for identification of each fuse.
in proportion to engine coolant temperature (see figure
1-47. The instrument voltage regulator is a small voltage
divider which reduces system voltage to six volts for
instrument power.
Figure 1-12. Instrument Panel'
1-13/14

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