You're probably going to need at least one engine casing and probably a new flywheel (well, I say new, second hand off eBay or scrappers). This is for the pickup sensor to mount to the casing and the extra nobble on the flywheel that it senses as it passes each time the crank turns a rotation...
Is it my imagination or has it changed? I believe it used to just say "80 KAs" at the start, now it says "Find 80 hidden KAs"... Did they have to explain what it was about to the average KA buying punters?