I called Mud Hog, and according to them these are for 90 series tractors, and were never intended for the 70 series. They originally came with a hydraulic valve box with electronic sensors, and an electronic control box that mounted in the cab to control the front assist. Nothing is available for them (no surprise there), they couldn"t even send me information on them or a parts tear down for them. It seems that companies now toss their older materials, or they just don"t want to look outside the computer.
Personally, it seems that these would have a place on a 70 series tractor, but since Case had a MFD option for the 90 series, why would you go with this over the factory option?