Gauge Data Expression for Percentage of Total

[EricDaechsel]

I want to use a data expression in a Gauge dashboard element to display the percentage of one land use's area compared to the total area in the layer. The fields from the attribute table I'd use are LANDUSE and HECTARES.

The picture below would be the output I'm looking for.

Thanks!

[jcarlson]

Could you just have a category selector filter the gauge data, but not the reference value? Or if it's static, just set the filter manually. No need for a data expression for this.

For instance, here's a US States layer from the Living Atlas. I can set the statistic and maximum value to a sum of population, then add a category selector: