Hi, I have searched the web and TT.net, and can't find any info on this. Does anyone know if an NA speedo drive (the insides) can be used in a TT? I know our TT's have the boost guage, but wondering if this is the only difference. I'm familiar with the insides of the TT speedo and cluster but I would like to know if anyone has been able to use an NA 'head' in place of the TT. many thanks