Migrating To Google Tag Manager
I have a very big ecommerce site with thousands of products and using several tracking code e.g -adwords, analytics, bing & fb pixel.
I want to migrate universal analytics to GTM with no loss of data.
Please suggest how to safely migrate because there are several tracking code.
Re: Migrating To Google Tag Manager
If they do, then edit the UA tracking code in GTM with your original UA from Google Analytics. That way you have tested to ensure it is working properly and will not lose any data. You could probably do the same for the other tracking codes as well depending on the platforms (Alexa tends not to like me).
My reason for suggesting you do it this way is to prevent the data from getting skewed by not firing properly or getting reported in duplicate under the same report.