I've heard plenty of stories of aftermarket electronic ignitions failing, but have one installed because when they work, they work well and do not need adjusted/monitored -But I keep a complete distributor (with points/condensor/rotor/cap/wires) and plugs in with the spare. I have a tiny spare so also have room for a scissor jack, lug wrench, an old belt, water pump, meter, and generator. I've had 2 issues with generator bushings (maybe I keep the belt too tight) and was glad I had one on my last trip. I carry a multimeter, cross and flat screwdrivers, 2)1/2", 9/16", 7/16" and adjustable wrenches, pliers, dikes, a small multi-tool and 2 quarts of oil. To get it all to slide into the spare slot, it slides on a towel so I always know where my towel is. And don't forget the fold-up side curtains. On the "occasional seat" I have 2 sweatshirts, 2 windbreakers, a blanket, 2 warm hats, 2 sunny hats, and 2 towels because weather can change when you least expect. I had more than I needed for my last 5,800 mile trek.