the lubrication system is most important to the “health” of your engine. Vehicles use two methods to check this lubrication system: the light and the gauge. Some modern cars have both. The light is supposed to come on right before you start your car and goes off soon after the engine starts running.so if the light ceases to come on, it means there is either a sensor problem or a burned out bulb. A gauge should start reading at zero then rise up to at least 1/4 of the gage range on startup. However what do you do if you oil pressure light comes on and or the gauge falls below 5PSI
The meaning of this is that your engine has lost lubrication and is wearing out from inside. You action depends upon the circumstances. If you notice this when you are just driving straight down the road at highway speeds, turn off your engine as fast as possible and pull off the road. Check the oil level and add oil if necessary. If the oil light goes off or the gage reads within normal range after you add oil, cool, however continue the routine of regular oil check. But if you gauge and there is plenty of oil in the engine, it may be that there is an electrical problem tripping on the light or making the gauge read low. Whatever the case it would be best to have the car towed to a mechanic who would conduct a proper check.