Cliff - if you're reffering to yer 59, you can get a new speedo - like
here at American Classic , or you could get yours rebuilt
at this place , or maybe others
you can also get the same for the 52
what makes you think it's "about to go out"? is it jumping around? that is a sticky cable, and you should try that as a first step to save some bucks, don't discard the idea - nothing can go wrong w/ the needle, and what it's attached to is a magnetic thing that gets spun by the cable, no arms involved
Bill