This site is very educational. Its has articles about using logic probes, wiring up LED's, soldering and much more. The author seems to be a pin head because lots of his repair logs are pinball repairs. He also has an article about building a williams tester at the bottom of the home page. Check it out.
Article about using a logic probe:
http://www.techdose.com/electronics/Using-a-Logic-Probe/395/page1.html
Repair logs, many about pins:
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Herndon, VA