New to me 73 duster 340

One thing I did notice was the oil pressure seems to me excessively low. Once warmed up at idle is only around 14 psi. I read all sorts of numbers of what it should be and couldn’t get a conclusion on that. Spoke to an engine builder locally and he said 7psi per 1k rpm and it’s sounds about right where it is? Does that sound right?
It's not great, but it's ok. What is the oil pressure at around 2000 RPM?