Yes, you can have two Y axes. You right click on the one you have and choose "Duplicate Scale" to get the second scale. You can then choose to "Swap Sides" if you want it on the other side of the graph. From the Plot Legend, you can click on a plot to choose which Y scale will be used for that plot. You might also want to play with grid colors or something like that to get some visual clue which plot goes with which scale.
