Guides need numerical entry to position and also work with snap (mac)

I have just tried to accurately position the guides and also to snap to an object so I could accurately size an object to another object. Guides’ position is not reflected in the data entry text boxes top right.

Smart guides help an do the task but to get a specific size I needed to create a shape and size it using the data entry and then use that as a guide with smart guides and finally delete it.