Triumph GT6 Mk3 "Smiths" tacho / rev-counter in excellent condition.
3.55:1 diff ratio, turn signal and heated rear wondow (demist) warning lamps.  Part No. RN2319/00AS
Good working condition, no corrosion, lovely chrome and black trim ring.  
Overall a very nice tacho which has benefitted from having the glass cleaned inside and out!