The Fords have a Front hydraulic kit to add a second valve & cylinder. They want you to hook it in to a power beyond port on the existing valve. But, the adapter for that is NLA and very hard to find. Here's a pic of the manual page.
The valve at the top left is existing. The return (9,13,14) for the 'new' valve goes to the existing tee in the return line. Could I not just put a tee (fitting just above 14) in the line feeding the existing valve and use that to feed the 'new' valve? I happen to have another valve and cylinder with actuating handle to make this happen.
Here's what is existing on the tractor.
Just throwing this out as I have the Ford apart right now for some needed fixing. This would be a lot easier to do now.