Unless the idle is way too low, the pressure should be ok so the light
should be off.

You could disconnect your oil pressure sensor and make sure that the
light goes off and stays off. If it doesn't go off, you have an issue
within your dash someplace and it isn't old pressure related at all.
Since oil pressure sensors are pretty cheap, you could replace it to
see if the problem goes away.

I would not change until you know for sure you are not having problems
with your oil pressure because changing might just mask the problem
temporarily. It will be like putting a bandaid on a bullet wound. You
don't want to drive around with a failing oil pump as that will destroy
your engine when it fails.

Remco

did you get it fix? I have the same problem with my car now. Can you
help me? Thanks