Looking at Global Cruise system by Rostra can be normally open or closed switch. The problem is nobody makes a after market cruise control that will work with the ford steering wheel control. The cruise control uses a single wire ohms reading. Off is less than 50 ohms, Set - is 285 - 315 ohms, Set + is 570 - 630 ohms, Resume 1055 - 1165 ohms, On 2004 - 2216 ohms, No switch pressed 4094 - 4526 ohms. The engine in the truck is a 6v92 Detroit Diesel mechanical control.