Triumph 3HW speedo gear box is fitted on the front brake plate, which is on the right hand side, that would mean that the 18 or 19 tooth pinion on its shaft would turn anti clock wise, out put should be clock wise.
Yes Indeed (Apart from some Royal Enfield's!!) At jumbles, I'll always check those M20 type that sit on the nearside hub. Turn the drive dogs clockwise and the cable drive should also turn clockwise.
Unfortunately 99% of the ones you pick up are the wrong rotation. Ron