You'll want to tap into one of the hydraulic blocks....... not sure if your tractor has one or two. It may mean a trip to your dealer (or an internet purchase) to get one. From there its pretty simple...... hook a pair of hoses up to the hydraulic block and run them to the rear of the tractor. I did this to power my backhoe..... same concept. When there is no splitter (or anything else) in line, the two hoses are coupled together to complete the loop. There is LOTS of reading on this site that will explain it.... just use the search function with key words like 'power beyond' , 'backhoe hydraulics', 'rear remotes', hydraulic circuit', etc. Its definitely something a do-it-yourselfer can do...... i'd estimate between a hundred and two hundred dollars for the required parts.
That being said, the self powered vs. tractor powered splitters are much like the Ford/Chevy , or Kubota/JD debate. You will need to figure out which way is best for you. Certainly tractor powered splitters can be cheaper..... but are they in the long run? Put the hours on an expensive tractor engine, or a $200 easily replaced small engine? You'll have to decide which is right for you. I frequently need my tractor to perform other chores when I'm splitting (like lifting chunks of wood)...... so a self contained splitter was right for me.