Re: 992 GT3
I always took the leather in my 911, RS or Carrera. Just gives it a little touch of luxury and helps on resale.
Colored tachometer is a very personal decision. Personally I always go for black, even when the white is standard, I have it changed to black.
But i have seen some configuration where red looked good ( just not when the leather is also red)
If going with colored tach I would also do the Chrono dials. Better to match both.
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964 Carrera 4 -- 997.2 C2S , -20mm -- 991.2 GT3 RS