A suggestion for which I expect to be roasted: replace the oil pressure
sender on general principles.
My reasoning is that either the pressure is good or it is bad. If the
pressure is good and the light is coming on, the sender is bad. If the
pressure is bad... well, an 11 year old sender is worth replacing anyway.
Replacing the sender costs about as much as checking the oil pressure and
tells you most of what an oil pressure measurement will.
I'm thinking you are the victim of odd circumstance... I can't think of any
reason for the oil pressure to act up after you changed the camshaft seal as
long as oil isn't pouring out.
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