Replied 10 September 2017, 11:48 am EST
You have mentioned that you are using "Studio for ActiveX", but the dlls you have provided are for "Studio For ASP.NET Ajax" .
So, I tested the issue for "Studio for Asp.net Ajax" and was unable to replicate the issue. I request you to please download the attached sample and host it on your IIS 7 server and see if the issue persists. Make sure you have set the "Application Pool" as DefaultAppPool.
If this sample works fine, I would request you to please make sure you have registered your C1Gauges control in the Web.config file.
Please check the Web.Config file of the attached sample for the required settings to publish a WebSite on IIS 7.
Hope this helps..!!