I own an older New Holland Skid steer l553, I'd like to add auxilary hydraulics to it and thought it may be as easy as plumbing into the existing hydraulics and adding a spool valve. Is this the case or do I need to add another pump somehow? Don't even bother replying if your going to tell me to buy a different skid steer with aux. already on it. Some ignorant salesperson already told me this. I was also wondering how difficult it would be to convert to joystick controls since i've acquired a set of CAT joysticks. They have extra ports and controls for aux. Is this the answer to both prayers?