2013 cayenne dash clock

[Jamieq]

Hi guys
I’m a newb here , I have a cayenne which I have put the original Chrono clock in the dash , I have wired up according to the diagram but have found out I need to get the pcm flashed or coded ? I rung around but aren’t getting anywhere, do I have to go the Porsche to get this done as I think they will charge the earth
Thanks
Jamie

[Jamieq]

Hi no there was no clock at all , it came with the black surround clock and cable, 4 connections live ground can high can low , I installed as Instructed, but when I turn on nothing?