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I'm curious to learn why Porsche keeps this speedo design
I'll bet it has to do with display area and total cost.
By having overlapping faces, each instrument can have a somewhat larger display area for a given instrument panel width.
By having an integrated set instead of individual gauges, the assembly process is much simplified on the vehicle production line. Much of the former instrument panel labor cost can be outsourced to the gauge supplier. The integrated design means that the gauge supplier can use more automated and/or fixtured assembly to give Porsche a lower total cost.
It might have been more fun to have a unique instrument panel for the Carrera GT, in sympathy with the price of the car. However, I'm not personally offended that it looks like the other car's gauge sets. None of their really special cars of yesteryear had anything but "normal" gauges. They were only recalibrated or had special faces. The CGT follows in the same tradition.