I noticed this a few weeks ago. I almost scrubbed a hole thru the glass before I figured out it was on the inside.
Apparently HD tried an anti fog spray on the inside of the gauges for obvious reasons but in high humidity conditions and moisture gets inside the (primarily speedo) gauge, it runs down until it sometimes makes it hard to read the numbers.
My dealer gave me a copy of the bulletin where HD acknowledges the problem and is working on but does not have a solution yet. It goes on to say they will replace the gauge but there is a high probability of a repeat problem.
I'm told that they will replace the gauge ONCE under warranty and I have been advised to wait until close to the end of the warranty period to see if they come up with something.
I don't have a question, Just an FYI