Red squares on dash?

[Bushi]

Confident this is an obvious answer, but have rtfm and can't see any answer

What are the.little red squares that pop up on the dash, some times two....sometimes joined by a couple of grey ones....seem unrelated to speed....gear ...pedal ...

[LE62NDE]

I asked the same thing!
https://www.pistonheads.com/gassing/topic.asp?h=0&...