It appears that you learn something new all the time. According to period pictures and some conversations with knowledgeable people in our hobby, Porsche did not offer a matching 10k rpm tach for the G-Body cars until much later into production. According to one source, it wasn't until the SCRS that you could get a proper 10k tach without the silver needle of the LWB era. Looking at period pictures as well as restored cars that went to auction (IROC, Carrera RS 3.0, etc.) I can clearly see the silver dot 10k tach. That now goes on my next wish list!

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