Linear gauge modifications

Hello, 

I have two values.

"allowed level" aka permit level
"actual amount" aka pumpage

In short, I want my visual to show something like this below, where the maximum range is the permit level, and the pumpage is visualized to see how much is remaining. For locations where there's no exceedance, this works fine like below.

For locations such as the one selected, where the pumpage exceeds the permit level, how do I edit the values under the visual to show exceedance? Here's what I see now, it just defaults to show 50% full.

What I want is something like this (excuse my drawing ability)