I'm facing the same issue as well. I'm developing the site locally, so there's a challenge in sharing a public URL that could help you. So, I'll have to be elaborate in this note.
The issue is as follows:
When I use one gage with several elements in it, the graphic appears. However, when I use multiple gages on the same post/page, only the first one shows.
I looked at the HTML output produced and found that class="gc_active" is added only to the first gage (Which shows) and not for the other gages on the same page. I think this issue comes from the $wrapCode element that contains adding the gc_active class.
Could you help here, please? How could I make all id="gage_chart" active?
Thanks in advance!