How do I add F5 Temperature data to a custom graph?

Hi folks, I'm trying to create a graph to monitor temperatures in our data center and was trying to pull data from our F5 devices. 

We have some F5 BIG-IP i2800 devices and I can see the nodes have temperature sensors and readouts already in the mode details like such:

I can even pull up a graph for one device by clicking on Temperature Sensor 1, but I want to combine graphs from multiple F5 devices. I've been trying to create a custom chart and insert the html as an iframe, but it takes the whole page. Is there any other way to do that?

Thanks!