What if I am using Tag Manager?
The first question you might be asking is, what do I need to do if I’m currently using Google Tag Manager? The answer to this is simple. Nothing (assuming you are using their built in tag type and not using a custom HTML tag type). The global site tag is really designed for people who aren’t using Google Tag Manager yet. So if you’re already using Tag Manager, and you’re sending data to Google Analytics, using the built in analytics tags, then you don’t need to do anything. Just to highlight you shouldn’t be removing the inbuilt Google Analytics tags and using a custom HTML tag either. This won’t give you any extra benefits.Should I use the new site tag?
Now you might be asking who should use the global site tag… well basically, anybody who isn’t using Google Tag Manager. So if you currently have the Google Analytics tracking code embedded directly on your website, then you should consider migrating to gtag.js. If you’re currently using the dedicated Google AdWords conversion tracking code, which is the conversion .js code, then you need to migrate to gtag.js to avoid inaccurate conversion tracking. This is because of the recent addition of intelligent tracking prevention in Safari by Apple, which means you’ll be missing conversion data with the old tracking tag. However, if you’re going to take the time to migrate, then you’re probably going to see more benefit by implementing Google Tag Manager. If you do, you’ll be able to take advantage of tag management and all of the new built in triggers in Google Tag Manager. An alternate option is to link Google AdWords to Google Analytics and import your conversions into AdWords, this will mean that you’re accurately tracking conversions. Even on Safari, the global site tag is really designed for people just using Google Analytics. And just using Google AdWords tracking, the best way to think of the global site tag is a simplified version of Google Tag Manager. It provides new flexibility. For example, you can currently modify the tag to simultaneously track into Google Analytics and Google AdWords. Here’s an example of one tag that will only send data to Google Analytics, and another tag that will only send data to Google AdWords.

