Variable for Vanilla Score?

[superjes1]

Hi all,
I'm trying to set the scoreboard for a mob arena, and I don't know what variables to use. (i have very little coding experience)
I have all the data set up in Vanilla Scores, and just want the scoreboard to take that data and update when it does.

As Example:

I have a score set up for the wave that the player is on under "Wave, Stats" (The player is called "Wave", and the objective is called "Stats").
How do I get the scoreboard to look at that score, and get it to update on the scoreboard?

I'm aware that I could just use the Vanilla Scoreboards, but I would like on that looks better with the custom colours.

Thanks
-Superjes1