First, Wallyworld "techs" are not allowed to tell you anything is wrong with your car. If the light is on and the engine is knocking, chances are good that there is internal bearing damage. If the engine seems to be running OK, the passageway to the pressure sending switch may be plugged with debris or the screen that the oil passes through on it's way to the pump may be obstructed with sludge. The only real reliable way of cleaning that is to remove the pan. Only other thing you could try is using some engine oil flush, changing the oil again and using a synthetic oil (Wallyworld synthetic is made by Quaker State...good) and add a pint of marvel oil to it (adds extra detergents and solvents). This is not fool-proof and as I said, any knocking, the engine is gone...don't bother. If it works, change the oil again at 2,000 then at 3,000 and continue using a good grade of oil and marvel (for insurance).
You can also install a mechanical pressure gauge in place of the sending unit...that way you can read the actual oil pressure (above 20psi hot is OK, best is above 30 at idle).
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