I need experienced advice in specs to look for in an oscilloscope for auto repair. I will primarily be working on older mid 80's fuel injection, but might need it for newer (late 90's) cars. I'd be using it not so much for internal ECU work (I'm not an electronics person), but more for oxygen sensor and fuel injector type work. I'm hoping there's someone here who is also into car repair and might have some good suggestions. I'm hoping I don't have to spend any more than around $400 - is that crazy? (Obviously for a used one.) - Chris P.