For the kill switch, I wired up a blown fuse actually to plug into the fuse carlosw2 indicated, then cut a little of the fuse box covers edge so the leads could escape unharmed.
more info:
If the inline fuse burns out, just unplug the whole kill switch circuit and plug in a fuse till you can fix it. No kill switch till then, but the car will run
I didn't have a burnt out fuse, so I popped one on the battery with a jumper. whee.
This technique is sure to work on a lot of different cars.