Using tag historian data to generate digital display element

So maybe I am asking something REALLY dumb here but I so far cannot find a way to do this… I want to use tag historian data to generate a display element. For example, we extract water from wells and I run a total throughout the day for a given well. On one of my screens I want to be able to display the water drawn from that well today (easy to do, just display the value of that tag) but next to it I want to display yesterday, the last day, and the last week. These are all values I can get from tag history but cannot find a way to get them on the fly and display them. Am I missing something or do I need to be doing this in the background and feeding it into tags to use for the display?