I saw the two cars with the same gauges, and wonder why someone went to the trouble of outlining thier gauges in this odd fashion (top set)

There is a consistant wavy pattern to the way these numbers are outlined, and I didn't realize it wasn't factory until I came across the 2nd Merc and took photos of it's gauges for contrast

These (below) are a little harder to see, as the windows to this car weren't open enough for me to get better photos