Should be there in another few months :)
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My fancy pants pov pak only has the light, maybe i should go buy some gauges
99% chance it is the sender. They are very prone to getting grunged up and being slow to see the true pressure however if genuine then low oil pressure is something to be addressed quickly
Given the cost/complexity of of rrsing about with the pump etc I would def recommend you try a "known" good sender first tho.
Pretty standard for a td42 and oil light to go out in about 5 secs. Oil pump isn't hard to do its only a gear pump. Different filters will take different time as well most these days have an anti drain back in them but they will still lose some oil being mounted horizontally.