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There is a pressure-release valve in the oil pump of a 261 engine. In the 261s that I have had, the pressure on the gauge showed steady pressures no matter the temperature or oil I used. I'd expect that to be the case on a newly rebuilt engine that has a good oil pump.
The pressure-release setting produced a reading of 30 psi on one engine and 40 psi on another engine. I think that people have reported a reading of 45 psi on their engines. This variation in settings could be due to different release-valve (spring?) settings in the oil pumps or mis-calibrated oil pressure gauges.
I'd be concerned if the oil pressure reduced below the normal setting - at lower RPM or at higher temperature.
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