Speedometer
The speedometer indicates the approximate speed of travel of your
boat in miles per hour and kilometers per hour by measuring water
pressure against a small hole in a device mounted on the transom or
stern drive. Obey all posted speed limit signs and slow down near
other boaters and swimmers to a safe speed. Remember, you are
responsible for the wake produced by your boat.
Typical Speedometer
Tachometer
The tachometer indicates the speed of the engine in revolutions per
minute. The tachometer allows you to monitor the engine speed so
you can be sure not to exceed the recommended limits described in
your engine owner’s manual. Some tachometers equip an hour meter,
which is useful to time your maintenance needs.
Typical Tachometer
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Chapter 3