Add New Ruby Gem to OpenStudio Ruby Installation

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How can I install a new Gem in the Ruby installation that is installed and used by OpenStudio. I am using tiny_tds successfully outside of running OS measures but can not resolve the same require statements from inside running measures. I have tried copying the related Gem files directly from the external Ruby-200-p594 installation that works in RubyMine to the OpenStudio installation folder C:\Program Files\OpenStudio 1.6.0\ruby-install\ruby\lib\ruby\gems\2.0.0\gems but this did not resolve the issue. Is there a process for adding new Gems that OpenStudio measure will be able to find?