I am so grateful for the help I received with my gearbox I want to give something back to this forum.  I'm a retired electrical engineer and a hobbyist machinist.  I have done a fair amount of work reverse-engineering the TR280i's electrical system. Cheers.   I have replaced the .PDF file with an entire website: https://www.ossa-efi.com/home  It corrects some errors and omissions as well as providing greatly increased technical content.