Oil Pressure Gauge - Jeep Wagoneer 1977 Owner's Manual

Ammeter
This instrument is used on Cherokee, Wagoneer, and Truck
models to indicate battery charging or discharging. With igni­
tion and all accessories off-the pointer should be centered
at zero. Immediately after starting, the pointer may indicate a
high rate of charge ( + ). However, as the battery becomes
charged, it will drop back toward zero. When the battery is
fully charged, the pointer is slightly on the charge side ( + ).
The electrical system should be checked whenever:
• The pointer indicates discharge(-) or no charge for an
unusual length of time.
• The pointer indicates a high rate of charge ( +) for an
unusual length of time.
Tachometer
�he electric tachometer sweephand indicates engine revolu­
tions per minute (RPM). To achieve maximum performance,
do not operate engine in the area marked in red. Operation in
the red zone could be detrimental to the engine. (Optional on
CJ models.)

Oil Pressure Gauge

This gauge indicates oil pressure but not oil level. Pressure
vari�s wit� en�ine speed temperature, and oil viscosity. Cold •
'.
engines give higher readings. Sustained high speeds cause
lower readings. Sudden turns or stops can cause a mo-
menta. r y pressure drop. Normal readings are 20 to 60 psi in
city driving, 45 to 60 psi at highway speeds. Hot engine idle
pre_ s sure of 13 psi is satisfactory. Consistently lower readings
indicate possible malfunction or low oil level. Stop for a serv-
ice check immediately.
Light Switch
The light switch regulates the lighting by being pulled, pushed
or rotated.
The switch has three push-pull positions. With the control
knob pushed all the way in, all lights are off. Pulling the
control knob out halfway operates the parking lights, and all
the way out operates headlights and parking lights. Both
positions also operate the taillights and the instrument cluster
lights.
Rotate the knob clockwise to dim the instrument cluster lights
and counterclockwise to turn the dome and courtesy lights
(optional on CJ models) on.
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