8700 ford joy stick

[bruceoffroad]

I have a 8700 ford tractor with a front loader I want to put a joystick on it that I got a couple of years ago new but never hooked up it is a Diesel Kiki 74809 P=142 I read in my book and know where to get my feed from, System Pressure Tube, I am going to feed it threw my joystick control valve but I cant find anything on the Joystick valve plumbing it has 3 ports on it labeled N. P. T. I think pressure in and out but what is the 3rd port for and can I plug it or do I need to plumb it into something else ??????
Thanks

 

[J_J]

Port Designation
Working lines A, B, C and so on

Pressure (power) supply P

Exhaust/Return R, S, T and so on

Power beyond PB

Do you have pictures of valve, close up?