I am rebuilding a smiths speedo and it has quite servere Mazak rot. The rest of the speedo is really very good. The cracking is severe enough that it would probably break up if used on a car for any length of time.
Long shot I know as these are the parts that go, but does anyone have one in a drawer where the rest of the speedo has rotted or been lost?
If not may have to do some convoluted modification/reinforcement to make use of this one.