1994 Buick Regal Owner's Manual - Page 122

Malfunction Indicator Lamp (Service Engine Soon Light) A computer monitors operation of your fuel, ignition and emission systems. This light should come on when the ignition is on and the engine is not running, as a check to show you it is working. rachometer SERVICE ENGINE SOON If the light does not come on at all, have it fixed right away. If it says on, or comes on while you are driving, the computer is indicating that you have a problem. You should take your vehicle in for service soon. NOTICE: If you keep driving your vehicle with this lighton, after a while the emission controls won't work as well, your fuel economy won't be as good and your engine may not run smoothly. This could as lead to costly repairs not covered by your warranty. The tachometer tells you how fast the engine is running . It shows speed in revolutions per minute (RPM). Do not operate your engine in the red line range. If you do you can cause severe engine damage. ~ 120