How do I send a signal when a Variable increases?

I have tried with 2 different variable instead of signals before, but I couldn't figure out how to make it work since I can only compare the two to each other.

Because of that I would like to know if it's possible to send a signal each time the desired variable changes.

One way would be to only change the variable with a function or custom action. So when you call that you’d know the variable is getting changed.