In the engine, it has a fixed displacement pump. The pump moves almost the same CC's per rev at all pressures (internal leakage does increase as the pressure goes up). If the pressure gets too high theres a relief valve in there somewhere downstream of the pump (often on the pump body).
If your pressure sender is before the filter, a higher reading can be caused by a non bypass type filter, a plugged filter, or finer filter media.
If the sender is after the filter, a higher reading means less restriction in the filter.
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