They might be hidden if you do not have the necessary data to display it. To show all gauges even when data isn't available go to Menu > Settings > G-Metrix and uncheck the box for 'Hide Overlays when I don't have G-Metrix for them'.
I added the gauges and it doesn't show any values, so I am assuming I dont have data for it.
Is there a way to add a sensor to show Pitch and Roll?
I am using a Virb Elite, I really like the level feature on the viewfinder, couldnt you just use that as a sensor and use data from that for a overlay gauge?
Im sure you cant since it currently cant but it would be really nice for off road and snowmobiling use since its really hard to tell angle in videos.
The Grade gauge does work but it doesn't line up with the video (its about 5-10 seconds behind).
Also is there a way to switch from grade to angle?