Wow, what a great thread. I was researching adding a new gauge to my r65 and came across the Acewell separately, then found this thread this morning.
I'm curious to know about the speedo cable that actually attaches to the gearbox like the stock setup. MIOB, you said you used a modified Suzuki cable... would you mind explaining the modifications, as I'd like to pursue that route than the magnet/rotor option.
1981 BMW r65 - Photos