[ovilla]

Definitely carry spare fuses and one or two relays (or use the one's from the front headlight motors - as long as your driving during the day). I also carry a fan belt and a really long screwdriver.
One time I went on a 4 hour trip and every time I stopped somewhere the 914 didn't want to start (NOTE: I have a 75 with the fuel pump under the gas tank). Anyway, I would use the long screwdriver to make contact between both studs on the starters solenoid and I was able to start the car each time. PLEASE make sure that the car is NOT in gear and that the parking brake is on when you do this. BTW, for the time being I byspassed the solenoid with a hot start relay and it starts fine each time now.
Other than that, keep in mind that most 914's are all about preventive maintenance or continual restoration. I like working on my 914 (great therapy), plus I want it to be really reliable so my motto has been to replace anything that can be unbolted or disconnected. During a 5-lug conversion the entire suspension and braking system was upgraded and I also bought a new fuse box and replaced ALL electrical relays (kept the old one's as spares). Even replaced the accelerator and clutch cable's and all cable fittings (you'll be surprised at how much smoother everything works after that).
Finally, carry a cell phone and add towing to your insurance. This way, no matter where you break down, you just call your insurance company and ask them to send a flat bed truck. Towing is only $5 extra on Allstate and they re-imburse you $50 for each time you have to use a tow truck.
Oh, when you're out on America's beautiful highways and you see another 914, ALWAYS wave back.