1994 Buick LeSabre Owner's Manual - Page 119

Voltage Indicator Tachometer 3 2\ \ \ . . _ % 5 '\ *6 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. The tachometer tells you how fast the engine is going. It displays engine speed in thousands of revolutions per minute (RPM). I NOTICE: I Do not operate the engine with the tachometer in the red area or engine damage may occur. 117