Re: Oil pressure low
I'd endorse RIN, swapping the senders is nearly free, if the problem stays with one engine I'd also be tempted to change the instrument heads over temporarily, if you still have low pressure then it has to be internal to the engine, either the pressure relief valve sticking open, or possibly the filter bypass (most engines have a bypass so that if the oil filter clogs you will still get some oil flow), but you'll need an engineer by that stage.
I'd do the sender and instrument change prior to changing the oil and filter but that might just be a personal preference....
<hr width=100% size=1>Rgds
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