This is a massively covered topic of late...thats why the search function is on the main page!
Basically, the connections on the back of the speedo do sometimes get a bit gunked up or wahtever, so a bit of contact cleaner from an electrical outlet will sort that-spray on, then push plug on/off several times. Another thing to look at will be the solder joins on the back of the unit also. These dry out over time-check they all ok. If they aren't, just a little solder repair job. They should solve the crazy readouts or intermittant info.
Job done! 
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Current: 2014 Ford S-Max Titanium X Sport
-- Previous Volvo’s --
:: 480 Turbo, 1993, 234 Polar White (with 'Richmod') :: Sold
:: 440 2.0i SE, 1994, 306 Smoke Silver Metallic :: Sold
:: 440 1.7 GLEi, 1991, 219 Ocean Blue Metallic Metallic :: Sold
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