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MANAGEMENT OF CAR—Controls, Switches and Instruments
INSTRUMENTS
Fuel Gauge. Registers the amount of fuel in the tank. It operates automatically
when the ignition is switched on.
Oil Pressure Gauge. Indicates pressure of oil being pumped to the bearings. It does
not show the amount of oil in the sump (excepting that if the oil level is very
low the pressure usually falls due to overheating).
A habit should be made of occasionally reading the oil pressure during the
course of a run, to see that the oil pump is functioning correctly. The oil
pressure gauge should read between 40 and 60 lbs./sq. in. (2.8—4.2 Kg./sq.
cm.) when the car is travelling at normal speeds and the oil is hot. Of
course, only a low oil pressure will be registered when the engine is idling or
running at low speeds, this is quite normal.
Speedometer. Registers vehicle's speed and total distance covered, and is fitted
with a trip which is cancelled by pushing the serrated knob (which is situated at
the right of the instrument panel) and turning anti-clockwise.
Warning Light. Glows red when ignition is switched on with the engine idling or
stopped. It is an indication that current is being drawn from the battery for the
ignition circuit, or other purposes that are controlled by the ignition switch.
Water Temperature Gauge. The gauge shows the temperature of the cooling
water at the thermostat. With the engine warmed up the gauge should register a
temperature of between 70° and 80°C during normal running.
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