If you've built a number gauge with multiple layers, you've probably run into a problem where it won't show the result you're looking for. Instead, it shows this "N/A" message:
The good news is the fix is really simple! What's occurring is number gauges can only display one layer at a time. In the screenshot above, the gauge is made up of three layers: two layers, and a calculation. What you really want to see is just the result of the calculation.
The fix? You can go ahead and 'Hide' the first two layers. This won't affect the data it's feeding into the calculation, but it won't try to display them anymore.
Update the gauge to save your changes, and you'll be set!