About the only things I see that you are missing are...
Cell phone, food, water.
With those, everything else is just an added way to spend extra time on the road not really solving anything. Now I've done my share of off-road trail fixes on my Jeep, but that's only to limp it back 6-7 miles to camp. There we have real tools.
When I'm on the road with a car, there are really very few problems you can fix. It is unlikely that your 914 will break a drive shaft
.
The things you can see going wrong on the road (that you should be able to fix), if you do proper maintainance and check it over before you go (so I'm excluding things like a clogged fuel filter).
1) blown tire. bring spare.
2) blown fuse. bring spare.
3) broken belt. bring spare.
4) broken wire. bring an electronics kit and simple tools to work on F.I. system.
That's about it. At least I can't think of anything else that breaks one can really fix on the road given reasonable tools and time.