Thanks Howler, yes the bike is Circa 82 Model. The Tacho and matching clutch case were procured and it works to a nicety. Yep the RD has been with me from 98 from my college days :). Restored only last year in August 2011.
beaut!!!!! youve got a rare setup ,, the tacho and the matching clutch case. or did you machine the stock one?.. its reg tells me its an 83 which means youve got the twin chain version,, bloody fast. oh,, and nice rd too! :D