I want to report an issue, which may be intentional or not - anyway, i think it’s wrong.!
When you create a “guide+guide point”, there is no way after that that the Tape Measure can reference to it and create infinite parallel guide lines.
But, when you do the same thing with other extensions (Fredo Draw Along, Dezmo Pro Line), then the Tape Measure can reference to it and create infinite parallel guide lines.
Testes in SU23 and 26.
Edit: In fact, afterwards, SketchUp engine doesn’t recognise that as an internal object - no other tool inside SketchUp can reference to it…!