can you convert back to a cable speedo from an electric on a frontera?

hi i have got a 1998 vauxhall frontera 2.2dtl 16valve estate (lwb) and it has got the electric speedo console etc, that everyone have problems with! and i cant find anyone to repair it and i cant get a replacment as there are as rare as hens teeth! can you convert it back to the more reliable and easier to get hold of cable type console? please help as it is driving me crazy.