How to make this guideline with measurement indications?

I’ve got this guideline inside one of my glyphs, which is good. And it has measurement indications on it, which is also really good. But if I make another guideline, I never get the measurement indications again, which is not good…

Am I doing something wrong? Is this a setting that’s I overlooked? Perhaps it’s not even a guideline but something else?

Does anybody have an answer to this? Thanks.

There is a small measurement icon in the info box of the guide.

Jawohl, sehr geil. Exactly what I was looking for.