Sorry this may be a bit off-topic. I had a similar requirement to show the latest temperature readings from a set of sensors in my home using a simple dashboard. Then I went on to using a MySQL database.
Recently there was an announcement on this forum about Clarify which you might want to look at as a way of graphically showing your data.
This is what the readings from two of my sensors look like in Clarify. Although I've shown them as two separate series, you can place them on top of each other so you make a comparison.
Incorporating Clarify in my original flow was fairly simple.
