[KevinH1990]

Please post a picture of your display showing the problem. That may help someone with more knowledge than me to confirm my theory which I discuss in the following paragraphs.

I suspect that your problem is that the LCD in your display has failed. The display is about 26-years old and electronic parts don't last forever. Replacement LCD's are available. Here's an example: https://store.minitools.com/en/sepdispkit-46a-b-c-kit-of-lcd-displays-for-porsche-911-boxster-instrument-clusters-miles-version.html I have not personally used this product. You might want to search other Porsche forums to see whether you can find someone who can speak from experience.

If you don't want to attempt to replace the LCD yourself, you may be able to find a local electronics repair service to do it for you. Other options include contacting nationally-known speedometer shops such as Palo Alto Speedometer or swapping your LCDs for the LCDs from a used cluster. (You can't just swap in a used cluster without programming it.)

When I installed my 996 gauges, I used the LCD's from my Boxster cluster to replace the damaged LCDs in the 996 cluster. You can read about that here: Carrera Gauge Swap

Good luck and please post an update when you fix your problem.