Er, that's an Engine Pressure Ratio , which is a thrust metric used in early jets in lieu of N1 RPM. YASim doesn't model oil pressure right now, because I'm not aware of a good basis on which to do so. If you have numbers you want to match for this particular aircraft, I could write you up some Nasal in just a few minutes which would do the job. 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.
How about allowing the config to contain a couple of sample values and then interpolating (taking into account outside temperature, engine temperature, and power setting)?
All the best,
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