I've been told it will start with a bad cam sensor, just not run as smooth. The cam sensor is used to time the fuel injection. For the crank sensor, look at the fault codes and see if there is RPM while cranking. If the crank sensor (or wiring) is dead, there will be no spark because it has no idea when to spark. I think you're on the right track to start with the basics, like attaching a fuel pressure gauge. An easy way to check spark is to put a timing light on the plug wires.
