An XDA member has cooked up a method to make the Gear work with the Nexus 5 – it requires installing the Gear Manager app and a few other APKs that are required for the Gear to work, and apart from a few functions not working, such as S Voice and Weather, the smartwatch will be doing almost everything that it would do when connected to a Samsung smartphone (like the Galaxy Note 3, S4, and others.) It's not known whether the method works on other devices, though we're in the process of trying it out on a Nexus 7 and will update this post once we're done.
Of course, this method is mostly useful for those that have both a Nexus 5 and a Samsung phone, as no one without the latter would buy the Galaxy Gear in the first place. But if you do fall into that camp (or can borrow your friend or relative's Gear), then you can hit the source link below for more details, or head to this link for a step-by-step guide on how to set up your Gear with the Nexus 5.
Update: We tried to connect it with a Nexus 7 and the two devices did try to pair, and would like to point out that you'll have to reset your Galaxy Gear to factory settings if it's already connected to a Samsung device before you try to connect it with your Nexus 5/7.
