Figure on anything electronic not working perminantly until it can be repaired with non blown parts. Think of EMP as a voltage/current spike, so it would have the same effect on electronics as blowing a fuse. First, an old non computerized diesel has less basic electronics then a gas engine, so like mentioned you are better off with that. Also, chances are the starter setup may go bad, so you need to be able to push/roll start the vehicle, so you need a manual transmission. Also, remember that chances are your A/C, Headlights, Radio, Interior lights, Gauges, wipers, ect may or may not work.
Now, as to basic electronics. I've read that LEDs, fuses, batteries that are regulated, ect would be bad if the pulse is big enough, so don't count on your flashlight either. The good news is you can protect your equipment with a faraday cage, they are simple to make and protect equipment quite well. The goverment has quite a few buildings surrounded by a faraday cage, so it is possible to surround your house or garage in one if you had the time, money, and energy. <img src="/images/graemlins/smirk.gif" alt="" />