Speed Warning Indicator speedometer

[hotrod68]

  My '68's speedometer crapped out. It won't indicate mph anymore but the odometer still works. I see that Rick's has a replacement with the speed warning indicator option. I'll have to buy the adjustment cable as well, and I'm wondering where I might find or adapt a buzzer since no repros are available? For a few more bucks I can increase the potential value of my car if I can make the thing functional.
  I had a '67 RS with this option but it never worked. How much extra $$ and hassle can I expect to retrofit this option to my '68? I know the cost of the speedometer itself and adjustment cable--my question is how much more involved does it get? Are these repro speedometers worth a crap? Any feedback would be much appreciated. Thanks!

[68Zproject]

I'd see if you can repair the one you have.  There is a top of the line instrument repair place near me that does all sorts of classic cars.  They repaired my temp gauge with nos guts and needle and it was like $100.

[hotrod68]

thanks!