Just a comment:

"The white wire is the O2 sensor output. It runs under one volt output. Solder this connection for better long term reliability of the electrical splice, but crimp fittings on the other two black wires are fine."

Actually, when crimped with a proper crimp tool and weather-sealed correctly a crimped connection is more reliable that a soldered one. I know this smacks in the face of convertional logic, but here are the two primary reasons:

1. Under exterme temperature conditions, a soldered connection will come unsoldered. I realize this is an unlikely scenario, but the O2 sensor is in close proximity to the exhaust manifold. And I guarantee that the manifold gets hot enough to melt solder.

2. The process of soldering wires together actually causes the wires to work-harden. After a period of time of sustaining random vibrations, it will break. again, I realize that this period of time may be quite a while, but it will happen.

Remember, commercial airliner wiring is always done by crimping. And it isn't because the mechanics don't know how to solder!

But the key here is to use a PROPER crimp tool, and appropriate crimps. Don't grab a couple spade terminals and mash them with a pair of pliers. And also remember to weather-proof the splice with some kinda goo that will withstand reasonablly high temperatures (again, reference the exhaust manifold).