Instead posting here I decided to upload images to my page.
Here is detailed step by step DIY guide on how to customize your stock speedometer face. In the near future I hoping to update it with custom Tach/Clock faces.
CUSTOM SPEEDO FOR YOUR SMART.

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You will need to know how to use Photoshop or any other photo editing software in order to modify the gauges. You can change the font, color, add logos and even the photographs.
I created 6 different speedometer faces with various paper and layering combinations. Also I took my instrument cluster at least 10 or more times.
So, it was extensive R&D.
If you have any questions, please feel free to PM me or post it here. If anyone will decide to do it, please post the final result here. Also if anyone want to contribute the different designs or file formats I would appreciate it.
CUBE