I would guess the Pregio has more than 3 wires going to the ignition switch. Anything I’ve ever worked on does as well. With the wiring diagram for this car, you may be able to figure out how to properly wire the switch. Considering how simple the switch is, the van could be stolen in less than a minute so why bother with the key switch?
Given this statement, is your problem fixed? Or do you still need a lock cylinder?