But the idea behind YASim is to produce plausible results for all possible engines; oil pressure is one of those values that is (AFAIK) just too engine-specific.
Further to the point, here is some information from the Lycoming O-320 Operator's manual; it would make a good starting point for horizontally-opposed piston engines.
180 degF desired, 245 degF maximum [down to 160 degF and 210 degF below 10 degF OAT]
Normal: 90 psi maximum, 60 psi minimum, 25 psi idling Start and warm up: 100 psi maximum
All the best,
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