suzuki scooter (speedo cable fitment)?

hi there, ive got a suzuki cs125 roadie scooter the speedo has recently packed up , its looks little tricky 2 fit one around the cowling or is there any easy way ?..also parts are becoming hard 2 find 4 this bike as its now 27yr old but in exc nick ,do u know any suppliers that cater 4 older spares , as local bikeshops locally are closing .... Greatfull 4 any help gaz