Fly through a stop light camera on red with the hood open and one injector at a time disconnected and propped up in plain sight?
Several modern digital cameras have a movie mode. Almost all do. Some of the "prosumer" ones -- the mid-range $300-500 models that aren't full SLR but do have some advanced features, are capable of several hundred frames per second in video mode. You could then split out just the ones you wanted to keep. I'd be looking in that general vicinity for something that specifically advertised high speed capability.