I think you need to be a bit more specific as to what you want to do, do you want the deadman pedal to de-energize all systems? If yeah then I am sure is doable, just look at the wiring diagram and see where the deadman switch is attached to, and wire your directional controls (steering, driving). I've never seen a forklift that can move without the deadman pedal depressed, but I have seen forklifts able to move hydraulics without deadman pedal depressed I guess it depends on the model. I am not familiar with this specific orderpicker but we have orderpickers here too.