Nickelled walkthrough views can easily be tracked in Google Analytics by adding the Tracking ID (the format is normally UA-xxxxxxxx-x) in your Nickelled settings.
Note that walkthrough views are not automatically split out and Google Analytics will report the URL path - e.g. /your-guide-url. By default Google Analytics does not report the host (e.g. http://guides.yoursite.com)
For this reason, we suggest creating a new Property in Google Analytics to handle Nickelled guides specifically.