KPI Visual - Simple Calculation

I'm building out some sample data. I have a very simple data set that looks like this:

My hope is to create a simple KPI visual that shows the current month's performance (one visual for spend, one visual for count) and the +/- for the relative month. So, what I'd hope to see above is a large 6,912 representing units for the current month, then a Goal value of 10,327 (reprsenting prior month) and a % of -33% representing the difference between the current month and the prior month (goal).

I have built measures representing units for current and prior month, etc. Right now my field list looks like this:

It just shows the prior month's value and the goal as the same number. I've also tried moving my Units Current Month measure to value and this just generates a Blank in the visual itself. Any thoughts?