Tested by local consumer advocate and police dept. - apparently it works in some cars:

http://www.myfoxcolorado.com/myfox/pages/Home/Detail;jsessionid=EB5EBF25180F8256275B287B8915F915?contentId=3860376&version=1&locale=EN-US&layoutCode=VSTY&pageId=1.1.1&sflg=1

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1969 280 SEC
1982 300TD