So my car has the 472 in it and it came with an oil pressure gauge (at least that s what the previous owner said it was) He said the gauge was broken and up until today it hadn't been doing anything. This morning as I drove the car to work, I noticed that the gauge had come to life and was reading a shade under 50. what should it be reading?

About 35-40 psi. At idle, about 10 psi.