[skimber]

Does anyone know if the light guns you can get for some games work with a projector?

I'm not entirely sure how they work anyway!!

[Mr.D]

I would say if its a digital panel job then forget it.
A CRT fed with an interlaced video res signal ( either s-video or composite or maybe even component on some units) direct from the console ( no scaling or deinterlacing) might be OK but you'll need to have fairly low ambient light. ( which you really want for CRT anyway).