Speedo Woes

[Mr Juju]

Hi All,
I hope that I find you as well and as happy as you can be!
So, my Speedo packed up, along with mt Odo and I assumed that it was the usual problem of the Speedo Sensor rotor.
As I was a bit short on time I got my trusty bike guy to fit a replacement.
He did this and found that one lug had broken off of the old one.
Upon road testing my bike the speedo initially worked but when he took it on a more extensive test it failed again.
Something else that I noticed recently is that my fuel gauge has been glitching up and down.
He has suggested that it could possibly be the clock (circuit board) on the way out and the most economical way forward could be to get some second hand ones instead of racking up labour costs fault finding.
Has anyone had a similar thing?
I have the bike back for the moment as I need it for comuting and my bike guy is stacked out with other work and can't fit me in for a while anyway.
Making do with a speedo on my mobile phone for a moment as a guide.
I plan to take a look and make sure that the new rotor is ok and hasn't failed as this seems the most obvious  thing to start with.
Has anyone got any other fault finding tips that I can try?
Many thanks in advance for your help and advice!
Pete

[BBROWN1664]

I have had exactly this when the battery was failing.

[unfazed]

If your battery is good, check the plug at the back of the clocks for corrosion and the connectors under the left infill panel.
There has been cases of corrosion within the clocks due to water ingress corroding the circuit board, but any I have heard were outside in all weather.
It can be repaired if not to serious.
Clock failures on the the 600 are rare which is why it is best to check the connections first