Hi All,
Looking for some advice - my speedo has started acting weird in the last week or so. When I first start up it goes all the way to 260kph for a few seconds, then sits at 40kph whilst I am at a standstill. Then when I start moving it zooms back up again - I was apparently doing 190kph the other day down Burnt Bridge Creek deviation which was pretty impressive

After about 10 minutes it seems to settle down to be relatively normal though it is sometimes reluctant to drop to zero again when stationary. Fortunately I don't really need it to know my speed have had the car long enough to know what I'm doing by sound & tacho... The odometer seems to be recording normally as best I can test. This is a '93 Australian delivered SW20 N/A. I think the issue has to be electrical as I cannot conceive any way a mechanical device could act like this. Ideas -where do I start looking?
Thanks,
Graham