The jacket is meant to be used with the Guru. If you don't have a Guru you will probably have a problem. I think there's someone else on this board that uses a jacket without a Guru, but I think he cut a hole in it for a vent. I'd hate to cut a hole in something that cost as much as that thing does, but I'm not sure you'll have a choice. The worse part about a hole is that it will not be water tight for if you want to use it in the rain.
I did a search on this sight. I used advanced search and put in the words jacket and hole. That returned a lot on using the jacket without a Guru. Some say it can be done and others cut holes. You do what you think best.