Sublime_Text_2's project settings options.

projectx.sublime-project

{
  "settings": {
        "translate_tabs_to_spaces": false
        },
  "folders":
  [
    {
      "path": "/path/to/dir/projectx"
    },
    {
      "path": "/path/to/some/directory",
      "name": "optional_short_dir_name",
      "file_include_patterns":
      [
        "*"
      ],
      "folder_exclude_patterns":
      [
        "*"
      ]
    }
  ],
  "build_systems": [
    {
      "name": "test",
      "cmd": [ "ls", "$file" ]
    },
    {
      "name": "activate_projectx_env",
      "cmd": [ "/path/to/dir/projectx/env/bin/python", "$file" ]
    }
  ]
}

I normally use spaces for indents (for python & js), but the project-level "translate_tabs_to_spaces": false may be useful for Go, which enforces tab-formatting. For this purpose, though, an even better solution would be to use Sublime's 'Syntax Specific' settings. Credit to this post for an example. One thing that wasn't clear to me from the post, though, is that you first have to open a file in the target-language (say, a main.go file) before you can see the Preferences --> Settings – More --> Syntax Specific – User setting.