Adding max value to bar gauge

I have a bar gauge that shows how much VRAM my graphics card is using. I can show how much is currently taken up, but I cannot show how much total there is. The total is set as the max value, which makes the bar gauge display correctly, but this doesn’t actually SHOW you how much there is in total. Does anybody know of a way I can achieve this? See screenshot for example:

maybe a gauge would be better?