Yea, you use a power beyond port.
Since you already have a loader....the ports on the tractor become simplified. the only line you need to "ADD" is a tank line.
You simply take the PB port coming out of the loader.....follow where ever it is going to. This hose marks both the P and PB of the new valve.
In otherwords....you currently have your loader valve pb probably going to the tractor somewhere. Take that PB and make it go to the new valve.....and the PB out of the new valve goes to wherever that old hose went on the tractor. Then simply add the tank line which can be tee'd into an existing tank line.
Then its just the work ports of the valve going to the remotes.
Figuring out the hydraulics is the easy part.....finding a place to mount the valve and handles as well as couplers is where it can get challenging and may need some good fabrication skills.
I am sure parts have gone up in the 7 years since I did mine, but there is a link in my signature to what/how I did mine