How to use number to access gauges

[EOG]

Hi guys, I just watched the youtube on gauges, and have lots of gauges setup. But I can't remember or find how to set up preferred gauges to be accessible by clicking "g" then a number to select a quick access gauge. The video doesn't mention it, but I can access my ALS gauges by clicking "g" "1" which brings up ALS gauges. Any help is appreciated. Thanks!