Brunswick 750 IMPACT, Operation & Maintenance Manual

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2-11
Boat Operation Section 2
Engine Gauges
Your boat might be equipped with a number of dash-
mounted gauges that display the condition of various
engine systems.
The gauges power up when the engine ignition switch
is turned to the ON position.
The engine gauges are illuminated for nighttime oper-
ation. The brightness of the gauge lights is controlled
by the dimmer switch located on the helm station
switch panel.
Review this general information about each gauge.
Refer to the engine operator’s manual for detailed
information about the gauges and their functions.
Tachometer
The tachometer displays engine speed in revolutions
per minute (RPM). You can take the gauge reading on
most tachometers and multiply by 1,000 to calculate
engine speed. You can use engine RPM to influence
fuel consumption, adjust boat performance, and evalu-
ate propeller selection.
Some tachometers are driven by a signal from the
engine’s battery charging system. If your engine is
running and the tachometer is reading zero, you might
have a charging system problem.
!
CAUTION
Never allow your engines to exceed the
maximum RPM listed in the engine operator’s
manual. Excessive RPM will cause extensive
engine damage.