I was missing segments from the LCD display on the bottom of the tach. Palo Alto Speedometer did a great repair job for a whole lot less than a replacement tach from Porsche.

 

I have a similar problem with my display. The dealer quoted a price of $1100 to replace the tach/OBC display which I of course found to be ridiculously expensive.
How much did Palo Alto charge and what was the turn around time?

 

Ebay helps. I saw tach/OBC units there at silly low price.

 

Palo Alto charged $250 and the turnaround was about 2 weeks door to door. They replaced the LCD display and 1 bulb.