Jim, as I understood it, if you have 2 seperate electrical circuits then 2 seperate links are OK (with 2 seperate power lights) but weather they have to be together (or just near to each other) is a little unclear, and I suspect that if the robot design does not allow them to be together then it should be accepted by the event Organiser anyway. After all to make a Co2 robot safe you have to both pull the link and turn off the Gas and they are not always together so I dont see much difference.