I have a page that has a link. Unfortunately the link does not have an ID and I can't add one (technical issues with CMS). I have jQuery/JS code that can listen for the link click and fire a pixel, but I'm not sure how to create the rule in DTM.
For your Use-case you can create Create an Event based rule with Event type as "Click" and "Element or Tag Selector" asa and Please check the box to manually assign properties & attributes and then specify the attributes with their value. Please see the below snapshot for more help.