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Well, Google reverse image search failed me again...

25971

Some kind of jumper for testing? Figuring out firing order....? I obviously don't know :)

Something to do with the distributor?

Would it be of any use on a modern car?

agreed.

Can we play 21 questions?

Does its function involve electricity?

Or for an attitude adjustment?

http://www.metal-archives.com/images/2/0/4/7/20476_logo.jpg?2908

I was going to be all clever and use a reverse google image search to figure it out... all I got were some old weapons and stuff :facepalm