If your doing automotive stuff nowdays then you definately need the torx bits. The best thing I have found to keep in a 'general repair' type box is one of the sets that has multiple bits that fit a 1/4 inch hex handle. Find a set, or if need be two sets, to insure that you have both the torx, allen, straight and phillips, and hex bits. Add in a 6 in one screwdriver, a 1/4 drive rachet, a pair of pliers (I like to just use vice grips because of their verstility, especially one with the wire cutter part at the joint), a 6 and 10 inch adjustable wrench, and you can do many simple repairs. On top of that a pair of wire cutters, a roll of Super 33 electrical tape, a few zip ties, a small roll of like 150 grit emery cloth, and an inexpensive electrical meter (on top of, or in place of the test light as it will do the lights job and then some). Then throw in a few different guage wires at least 36" long, and a handful of crimp ends (but splices, ring terminals, spade terminals, etc)along with a crimp tool. With these simple tools there won't be many minor repairs you can't handle.