sorry for taking so long to reply.
i came off my loader valve control. loader valve has typicaly 7 lines. 4 go to the cylinders, one is power in, one is return to tank, one is power beyond. the power beyong is your "P" power inlet, as well as the "T" return to tank. If the loader is removable, typical there's a quick connect on the line, so thats a great place to break into it.
so genericly speaking, PB from loader valve to P on "new" control valve. T on "new" control valve back to PB line.
hope this helps.