I cook pork tenderloin in my oven on 194 2 hours it's a little tough wondering if I can now put it in the pressure cooker

I don't think additional cooking in a pressure cooker is going to make the tenderloin less tough. Pork tenderloin is a very lean cut and it has no connective tissue like a pork shoulder. Sounds like the tenderloin is already overcooked, so I don't think the pressure cooker is going to solve that problem. I would slice it thinly across the grain and serve.