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The new Dietz is a single box as well, and this seems to be a no-name copy with the same functionality.
 

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There were some recent dicussions here and on forums in Germany that one can code an A4 unit to A6 to enable the speed wire. The only issue is that there is no speed wire in the A4 and someone would need to get it from the instrument cluster or fuse panel. It is also uncertain whether or not the A6 coding will work in an A4 without issue. Drained batteries or other strange issues may be caused by incorrect coding.
 
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