Can't remember if I posted anything on this before but after seeing some of the beautiful pictures of vintage Ferrari interiors and dashboards, I thought about this type of tach. Was it ever used in the older Ferrari road cars? Back in the 60s when I lived in Milano, I helped a friend who maintained a few Italian race cars from the 50s. In particular, we worked on Stanguelinni and OSCA, as well as some British cars. Quite a few of them had chronometric tachs.