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at idle when its reading low and the message is lit up in the dash is there any ticking or abnormal noises form the engine at all ?
this issue will come down to as simple as a bad oil pressure switch OR a build up of sludge in the bottom of the oil pan causing the oil pick up tube to not be able to pick up oil that good or a bad oil pump
with no noises i would replace the oil pressure sensor as seen in this picture right above the oil filter and give it a fresh oil change
if it still does this then the oil pan would need to come out to check the oil pick up screen and oil pump
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if they connect a mechanical oil gauge to the oil pressure sender port on the engine and confirm the oil pressure is good then the oil sender is just bad usually
if they confirm the pressure below spec then the oil pan needs to come off next