07-09-2020, 03:07 PM
You perhaps already know the turns per mile that the speedo drive on the gearbox is giving but if not this website gives intructions for determining it, ignore the magnetic ref. it applies to governor types as well. There is also other useful info' elsewhere on the site.
www.magnetic-speedometer-repair.com/Howtocheck.php
Neil.
www.magnetic-speedometer-repair.com/Howtocheck.php
Neil.