I pretty much do what Minnreefer does (plus a voltmeter) except that when I need a Phillips screwdriver, I borrow it from someone else. Seriously, though, a set of Japanese Industrial Standard screwdrivers will do everything that Phillips screwdrivers do, but they'll do it better, and they will also work on those Japanese Industrial Standard screws on your engines. If you try to get those out with a Phillips screwdriver, bad things may happen to the screw. Someday I'm going to get a set for my field toolbox and stop mooching.

Phillips screwdrivers were invented for use in early machine-driven applications. The whole point is that they will slip out of the screw easily, which was good with crude machines driving them, lest they overtighten the screw and break something. Why people use them for screws that are turned by hand is a puzzle.