I was going to help a friend of mine buy a jammer. He already has a X50 so I thought the ZR3 shifter might be a good fit for him. I was looking and one of the accesories was the cable for the 8500 to the ZR3 contol box. Does it not come with this and if not can I just make up a cable? I think its modular. Or should I be looking for something totaly different? Thanks.