So it looks like a seats out, leather off, and Gearbox cover off. Then hopefully I will see the sensor, and set about sourcing a replacement.
Using a bit of reverse engineering from "Making a Morgan", which I have just treated myself to, the attached photographs give me some trepidation.
Particularly the words "With a good deal of contortion, the gearbox cover is installed"
Maybe I can live with an intermittent Speedo
