Good call re the pressure gauge, SalvadorP. The oil warning light switch itself could be faulty and nothing wrong at all with the engine. It is not unknown for the light to come on or flicker at idle especially with hot oil.and extinguish as the revs increase above tick over.
I'd be inclined to swap the switch for a gauge as you say to establish the actual value. I would then replace the switch if necessary - they are cheap enough - and also the filter, which can be changed without changing the oil. Offgrid will lose the contents of his filter (about a pint) and will need to top up the engine by that amount. It is also important to use a filter with an NRV - preferably a Volvo one.
Better still, why not fit a tee-piece and have a gauge in the car as well as the warning light?
Regards, John.
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