Buick 1994 LeSabre Owner's Manual page 119

Voltage Indicator
Tachometer
. . _
If you have the optional gage cluster, this gage shows
voltage in the electrical system. The normal range is 11
to 15 volts. If the gage reading stays in either red range,
have your Buick dealer check the electrical system.
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The tachometer tells you how fast the engine is going. It
displays engine speed in thousands of revolutions per
minute (RPM).
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NOTICE:
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Do not operate the engine with the tachometer in
the red area or engine damage may occur.
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