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Speedo Over-reading

Posted: 13 Jan 2017, 11:42
by MidLifeCrisis
Drove home last night and apparently I was doing 90mph!

Has anyone experienced a speedo over-reading (i.e. Not the usual under-reading/bouncing)
Seems to only occur when cold (outside air temp - not cold engine) - is it possible gears in the mechanism are sticking together and one is dragging another round?

Anyone got any ideas? (Other than pull it apart and have a look)

Re: Speedo Over-reading

Posted: 13 Jan 2017, 22:30
by bigherb
It is usually a fault with the tension spring there is no physical connection between the needle and the cable the needle is pulled round by the cable turning a magnet producing eddy currents.

Re: Speedo Over-reading

Posted: 13 Jan 2017, 23:02
by MidLifeCrisis
Interesting thanks ...... guess I'll be taking it apart to take a look then .. :ok