: What should be considered when going from "old fashioned" Google Analytics to Tag Manager? I already read a few questions on tag-manager such as "What is the difference between google tag manager

@Odierno851

You can still track "[...] custom events I created to know when someone watches our videos, clicks-through to a dealer website, or downloads a manual" using Google Tag Manager.

You would use Click Listeners, Link-Click Listeners, Form Submit Listeners and Timer Listeners to trigger your events. Here is a great guide to Auto Event Tracking in Google Tag Manager.

I would set up a test property for your site and test/convert old GA events tracking code to GTM. Once you convert and test everything just flip the switch on the production site.

I would recommend 2 options for testing your implementation of GTM:

1) PREFERRED OPTION - If your hosting is setup for a staging environment then I would set up a new property for your staging site and test everything there. You can create two GAID marcos. One for staging and for your live site. That way when everything is tested all you need to do is switch the GAID macro and publish.

2) You can use Google Tag Manager Debug Mode to see your changes before you publish your tags. Here is a nice summary of how GTM Debug Mode works.

Other useful testing tools:

Google Tag Assistant

Chrome DevTools

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