Or at least, not as I expected
The following query:
select level*10, 'SQLDEV:GAUGE:0:100:10:20:' || (level*10) progress
from dual connect by level <= 10;
produces the following output:

The first 6 rows are at least consistent with the parameters.
The next 3 the final segment has change to yellow (not orange); the last row the last segment is red.
The colour change occurs at ~67% or 90% respectively.
What I expected is that the last segment wouldn't change colour
If the colour is going to change, I'd rather it actually reflected the band the value is in, and it should be the whole gauge, not just the last segment - this way the colour of the gauge would indicate a problem (i.e. process < 10% complete = red, >75% = green), and the segments need not be shown....