[pcabc]

Its not perfect, note the signal just before the March 2021 covid crash.

Zooming in on a higher resolution plot shows that that is a small low, it does rise up after so it was correct, but then there is the sudden crash.

Edit: I jumped the gun a little, see the red line in the attached plot, which also includes the Silver and Gold Cross Indicies:
   

I recall at the time that although the markets seemed to be positive there was talk of lockdowns etc, so although ignore the news, listen to the tape is the mantra, there was good reason for pause at the time.