Reading and displaying the oil pressure from an off the shelf pressure gauge is trivial.
Pulling the oil temp from the OBD port would be more difficult than just reading it from a separate temp sensor.
I have an arduino datalogger in my racecar that logs all of the essential data and displays it on my phone like torque.
It just reads analog voltages from the oil temp & pressure gauges that are already in the car.
Check this out for arduino prototypes:
https://123d.circuits.io/