Research complete and the solder 'ring' is okay as is. It doesn't need to disappear. Pull tested the wires and they're secure. I finished the fuel pressure and oil pressure wiring and secured the wires. On to the fuel flow measurement wiring. I had to feed those wires thru the firewall opening - missed them on the initial feed. They were very hard to get too, but it got done. Soldered and pull tested okay. I secured all of those wires then went on to securing cylinders two and four spark plug wires on the backside of the engine. Due to the expected shaking and engine vibration, I left a little extra slack in all the electrical wiring.