Hi,
1) It depends on… Universal Analytics (UA) does not currently support remarketing and age/gender/interest reporting. Although it certainly will support this we do not currently know when.
If you just start your Analytics account I would suggest to create a separate web property with traditional GA tracking and another with UA. If UA gets out of beta you can simply drop the GA profile.
If you do not need remarketing/age/gender/interest features you may simply apply for just UA.
You can use add-to-cart events regardless what version of Analytics you are currently using in Google Tag Manager.
2)
– Start by creating a new tag
– Enter what you wish into the Tag Name field
– Select ‘Google Analytics’ or ‘Universal Analytics’ from Tag Type drop down depending on what version of Analytics you are using
– Enter your web property ID (UA-NNNNN-N)
– Select Event from ‘Track Type’ drop down
– Fill in event fields as you wish. I would suggest use Category=Cart, Action=AddToCart, Label=ProductAddedToCart, Value=0
– In the ‘Firing Rules’ section press the Add Rule button
– Enter a rule name as you wish
– Select ‘{{event}}’ from the drop down
– Enter ‘gtm4wp.addProductToCart’ next to {{event}}
– Press Save
– Press Save on the tag creation page as well
Hope this helps.
Cheers,
Thomas Geiger