Try installing the W3C validator link on the page and see what it thinks. The SteelSeries Gauges need to be UTF-8 encoded in order to display properly. My guess is that you’ve got character encoding at work other than UTF-8.
I have just reinstalled the gauges 1.6.5 zip and used Dreamweaver 8 to edit the gauges.js. I then uploaded it to my website and I now have the correct degree symbols. I just need to get the graphs to pop-up over the dials. They appear on the wxgraphs_test.html.