Standard speedos like this are getting increasingly hard to find these
days. This one, I know is working 100% although the housing and face are
yellowing slightly I am going to use it. It is totally original and
quite rare.
These are the markings you look for when hunting for a genuine Innocenti Speedometer.
Insert the speedo into the headset top. It should be quite a snug fit. Make sure your headset top is on a nice soft surface with nothing to scratch it underneath.
Place on the retaining ring as shown.
and fasten down with three 5mm long screws which have round slotted heads.