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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Today's Featured Article - New Life for an Old Allis - by Tyler Woods. My friend Jon, has an old '39 Allis Chalmers B. He thought it a marginal tractor that had long since served its time. She smoked terribly and never had much power but he couldn't afford another so he was limping along with what he had. Jon's Allis has a small front loader and though it doesn't carry much, it serves his needs. It was the hard starting and low power that made him think it was time to replace the old girl. Jon called me to help him discover why his tractor wouldn't start
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