We need to know the new Nissan pickup’s make.
Does the truck use a rack and Pinion or a Pitman arm?
Converting from manual steering to power steering is much more difficult than vice versa.
You will need a power steering pump, belt and a main pulley that can accommodate the belt.
You will also need a power steering rack if your truck uses rack and pinion steering and all associated plumbing.
This is all going to add up to a lot of parts, labor will not be cheap either.
A remanufactured rack and pump might be available. These can actually be better as they are often hand assembled and come with a longer warranty.
The rack should come with new tie rod ends. If it does not you might as well replace them while you’re in there.