Buick RIVIERA 1993 Manual page 112

Volts Gage and Light
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Tachometer
When you turn the key to "Run," the "LOW' light will The tachometer tells you how fast the engine is going. It
come on briefly, to show that your alternator and battery displays engine speed in revolutions per minute (RPM).
charging systems are working. If a light stays on, you
As engine speed increases, the bars light up on the
need service, and you should take your Buick to the tachometer display. Each bar represents 100 RPM. Do
dealer at once. To save your battery until you get there, not operate your car's engine in the red line range. If
turn off all accessories, and set your air system to you do, you can cause severe engine damage.
"OFF."
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