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when the light comes on at idle do you notice any engine noise different from the norm.if not then the oil pressure sensor(ops) is bad/weak and will need to be changed.if you hear abnormal noise with the light on then you will have to have teh oil pressure checked to see if its within specs.
Very first thing you need to do is install a mechanical pressure gauge on there to verify what you see on your gauge. If the actual pressure is low, then it's time to start looking inside the engine. If not, then you need to trace out the electrical problem but will know the engine is safe.
If you have good oil pressure, a few things come to mind, first it could be a loose rocker, secound it could be a woren or broken rocker, third it could be a weak or calaps lifter. If it sounds like its lower in the engine like around the oil pan it could be a rod or maine problem. But you say its a ticking noise witch leads me to believe its a valve trane problem.
The ticking could be a spark plug wire shorted out to ground of which you can watch in the dark while the car is running and see if you see a plug wire jumping to ground which will look like a lightening bolt hitting the ground. It could also be a lifter making noise. Could be a exhaust leak. What is your oil pressure? Does your gauge tell you pounds of pressure or is it just a light?
This may not be your problem, but recently we had chevy in with a ticking on acceleration that turned out to be a leak on the right hand exhaust manifold only slight but enough to make a noise when driven hard. we noticed a carbon mark around the second cylinder in. If it is a petrol engine have you checked the spark plugs are correctly torqued?