Your DSCV contols the FEL. Do you already have a 3rd SCV?? My 3rd SCV controls the hydraulic angle on my rear blade. The 4th and 5th control the top-n-tilt of the 3 pt. I would recommend using the JD SCV's as they are designed into the tractor and work quite well.
No, I don't believe I have a 3rd SCV, I originally thought I had one for the mmm, but the mmm is controlled with the 3ph, so I don't. Is there a part number or a kit that I can get from the dealer?