Does this tacho come from a specific series of Skyline? It's a pretty good idea, but when people see it will they be able to associate that tachometer with Nissans, Skylines or Skylines Australia if the SAU badge wasn't there?
I think that's the underlying purpose we need to keep in mind when designing stuff for a specific forum like this!
Edit: Whilst I'm posting, I'll just chuck up a slightly updated pic of my previous design. I'm not sure if I've got all the details right, so if you can see anything missing please let me know.