150 speedo reset rod peculiarly

AAndrews said
This looks like a 66 Barracuda Speedo to me. Is there a cutout at the top of the speedo ? I can't see it in the pics.

Yes, between 60 and 90 mph markings it’s cut out. So, at least I know it’s origin. Now to figure out my options and its usefulness to me.
Thank you!