Standard fitment to Meteor and Comet was 80 MPH speedo with Jaeger coupling. Jaeger coupling is a hook and eye with a bloody small (8 BA?) screw holding it together. Solid brass tube outer. Optional was a 120 mph speedo with same Jaeger coupling. Some of the early speedos had no light bulb fitting and others did. Makes no difference as who will ride an "A" at night???? The speedos are very hard to find in good condition and the brass tube may be unavailable . My New Imperial uses a flexible flat wound steel outer.