Autolite 200 mph Speedometer

Digging through a box of swap meet items I came across an Autolite box with a 200 mph speedometer. It has a mechanical trip reset on about an 8 inch cable with a chrome knob attached to it. Looks like mid to late sixties era. No part #s on the box or part. Any ideas what this part might fit.
I will try to post some pics

 

I'll bet if you post pictures it will be identified in short order.