The UTMZ cookie was for a long time a reliable cookie where you could find the source information of where the user came from. Unfortunately, this is going away with the introduction of Universal Analytics. We have build a quick script in GTM to bring you back the source information and even a little more. With our cookie solution you will have all the different referrers, utm_source and gclid information available in a cookie called source.
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GTM Ressource Guide: https://measureschool.com/guide
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RECOMMENDED MEASURE BOOKS: https://kit.com/Measureschool/recommended-measure-books
GEAR WE USED TO PRODUCE THIS VIDEO: https://kit.com/Measureschool/measureschool-youtube-gear