Place the pork tenderloin (trimmed of any fat) in the Instant Pot.
In a small bowl, combine the cumin, oregano, garlic powder, salt, and pepper. Season the pork tenderloin with it.
Add the lime juice and orange juice to the Instant Pot. Make sure the valve is closed and secure the lid.
Manually cook the pork for 30 minutes. Let the pressure release for 5 minutes, then flip the valve to release the pressure.
Lay out a tortilla and add 1 oz. of Swiss cheese, 2 oz. pork, 1 oz. ham, 2 pickles and 1 tablespoon of mustard.
Place the tortilla in a heated nonstick frying pan. Heat 2-3 minutes on each side, or until the cheese has melted.