Mine works, but it's 10% off. Odo and Speedo.
I have done enough reading to know if I was to send it in, specifying what the errors were to correct, it would probably come back worse.
If it was US...1,000 RPM is 60MPH on all...you just change the gear in the trans end of the cable....NOT all the silly gears in the speedo head....and different for odo and speedo...and stupid....but I digress.