My speedo is jumping all over the place and up to 150mph but
mileage recording ok.Suspect its a cable loose but how do i get to it to check it out. Model is Ghia si 1993
it will clip into the back of the clocks and into the gearbox....its almost definately a cable that is worn. it will cost u about £15 from a discount autoparts shop. u should have no problem getting one