Looking for a reasonably priced Bandit 600 engine for a 2000 model.
Oil pressure sensor came out of it’s mounting on mine and rattled round a bit doing a fair bit of damage.
If you can’t find one, you can always pop an oil-cooled gixxer 750 lump in - fits straight in 
(you’ll obviously need carbs / cdi etc. )
Had thought of doing it but cash is a bit tight at the moment and at least the carbs etc off the knackered engine are fine so no extra cash to layout.
Got my self one of eBay, hurrah the Bandit can fly again