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ACCESSORIES
9-53
and smoothly the engine vacuum remains high and the needle
indicates high vacuum or "Economy" on the face of the
indicator.
When accelerating or decelerating, the needle will
fluctuate rapidly and should not be diagnosed as a problem.
- -
Fig. 9-64 Tachometer
Fig. 9-63 Fuel Economy Indicator
TACHOMETER
The tachometer indicates speed of the engine in
revolutions per minute. The engine can safely be operated up
to a maximum RPM as indicated by the start of the red bar.
Engine operation causing tachometer readings in the red area
can lead to serious engine damage.
Due to its dual-coil design, the tachometer may not
return to zero when the ignition is turned off. This is a normal
condition and should not be diagnosed as a problem in the
tachometer.
The tachometer is available as a dash mounted unit on
all series except B.
CLOCK
The electric clock, available on all series, operates on
direct current from the car battery and must not be compared
too closely for accuracy to a home electric clock operating
on alternating current. The cycles per second of alternating
current used in the home are controlled and periodically
corrected
at
the
power house, thereby eliminating
accumulation of errors.
With the direct current system, no such control is
possible;
therefore,
automobile
electric
clocks
will
accumulate errors day by day the same as handwound,
spring-operated clocks.
The electric clock provides automatic regulation of the
rate when the position of the hands is changed manually.
Moving the hands forward or backward adjusts the length
of the hair spring to make the clock run faster or slower. The
amount of change in rate depends upon the amount the hands
are changed. Maximum rate change is approximately 20
seconds per day and is obtained when the hands are moved
five minutes. If the clock is reset less than five minutes the
change in rate is proportionally less than 20 seconds.
When setting the clock to correct for errors in time, pull
reset stem out, move hands counterclockwise to correct time
if clock is running fast, or move hands clockwise to correct
time if clock is running slow, then allow reset stem to return
to its normal position. This will automatically adjust the rate
of clock.
Owners should be advised to set the clock to the correct
time once a week at regular intervals to insure maximum
accuracy.
I
Fig. 9-65 Clock
Digital Clock
The digital clock is available on the B Series and is quartz
crystal controlled. To reset the time, push in and rotate the
thumb wheel to the desired time.
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