1993 Subaru legacy vz
 

Hi my speedo is not working it is cable type. Have ascertained that the problem is in the housing? (not sure of exact term). can anyone offer advice on how to replace this. I'm thinking to possibly drop the trans and replace the part this way but not sure how big of a job this will be, as have not removed a trans before. any advice or links on how to fix this problem be greatly appreciated.

cheers