Hello,
It looks like a little condensation. Although I don't think you should be too worried about this, I would keep an eye on it in the coming weeks and see if it gets any worse, or the gauge stops working, but again, I don't think you have anything to be worried about. Please keep us informed.
Thanks,
Alex
2CarPros
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Monday, February 17th, 2020 AT 10:15 PM