Things I've learned.
1) Temp guage location means nothing. Know where the needle normally is and if it get higher, worry.
2) A long cruse on the road is easier then a bunch of short ones in town. If your not haveing any problems with the car in normal conditions, you prob won't have any on the road.
3) Bring tools...
4) Due to my personal lack of faith in out 914, I will not be driveing from MI to CA in it. I will be taking my new Jeep.
5) Sign up for AAA or something of that sort (free towing and roadside assistance). I can make a bad day a bit better.
6) Don't expect to make it to your destination
and plan money for a hotel on the way. This way you won't get upset if the car breaks.
7) If your going 140 instead of 70 your 5 hour trip will only take 2.5. I don't recomend this approach, but its a thought.
8) Lifes too short to worry about everything... Have fun and if it breaks, it breaks.
good luck
Germain