I think i know whats happened i brought my car back from South Africa last year low spec all being in KPH , For the SVA test it obviously needed to be in MPH . I bought a UK cluster which wouldnt work because of immobilizer so just changed the face plate from the clocks so i had a MPH reading ( analog ) it got me through the test and on the road . I am looking at attempting to modify the circuit board to swop the 10 pin plug which is missing on the low spec for the digital speedo to push into . Will let you know how i get along if it works i will have to replace switches to change between KPH and MPH