Hi ged in Oz - the problem is that the clocks look really old & tired - the speedo wavers a lot & the magnet is cracked - at least one globe in the rev counter doesn't light up.
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I've just finished a complete resto of the bike so I'd like to get the units fixed up & looking better.
Seeing as you have done everything in the rest of the bike Adrian, I can imagine you’d be keen to get the clocks up to the same standard.
The mechanism in the speedo is pretty straight forward and I’d imagine the wavering problem is just as likely either in the cable or else the drive where it enters the instrument. It might be worth making sure that those points are both well greased and lubricated.
When I opened up my speedo, (to fix the odo/trip meter issue) I gave everything a pretty liberal douse with light oil which did help also. My internals were pretty rusty as a result of the leaking reset button on the face.
They’re not really that hard to open up and I resealed mine with a light bead of silicone and it seems to be holding up pretty well.
I haven’t managed to get around to fixing the duff light in my tacho as yet, (I don’t do a lot of night riding - random wallaby issues out in the bush.....) but I’ve noticed that a few of the guys here have upgraded to LED instrument lights which look to be a great alternative.
I’ve got a spare tacho off an R45, but the light in that one is buggered as well...