Changing the entire cluster is both very expensive and complex to do, as the cars key/immobiliser is coded into the cluster. I wouldnt touch it.
You can buy blue needles though: Tacho Blue Needles - r20 R-Line Look
Also some pics and info here: VWVortex.com - Golf R Blue Tacho Needles for GTI, 2.5 and TDI Golf models!
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