I found this additional photo that I no doubt posted in a previous OGR thread. It's a different AC-to-DC converter module. And there's that 2-wire voltmeter again this time at 4.5V so we were probably discussing a Menards application! The other thing is what Richie mentioned earlier, you can buy pre-wired coax plugs as shown on the right. Look for the 5.5mm / 2.1mm dimension. The wire lengths in above photo are obviously not long enough to connect to anything useful on a layout and are just by way of representation.
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