It think what he is saying is that testing the resistance of the wire statically, without the engine running and the ignition system not functioning, is not a good enough test to determine if it has degraded. In other words, it's only a test in the sense that a failure does mean it's bad but a good reading does not necessarily mean it works. He wants you to somehow test the system dynamically, while the engine is running (such as with a scope), so you can see with certainty that cyl 1 is firing like the others.
I actually found a place in europe with a website that appears to still stock those original Bremi connectors. Seems like they do trucks and heavy equipment, do you speak german? :-)
http://www.ochsnerag.ch/html/AggregateKeilriemenundZundungsteile.htm
Look under "Zundungsteile"