+1. Get the Omega miniature connectors. A little fiddly to get the wires under the screws IMO, but rock-solid connections and the end of crimped wires working their way loose and causing jittery displays.
Use the same. Added wire ferrules to prevent crushing of smaller wires, like on the pmag connections. Overkill, but I also shrink tube them. Don’t want any risk of the set screws touching other metal.
Do not attempt to solder TC wire.
My 2c, this is a waste of time and not as reliable as a butt splice. Ever try taking this connection apart? Nearly impossible without damaging the wire.
Soldering EGT/CHT thermocouple wires won't work. Those wires aren't copper / tin. Always some odd thing like iron and some other metal. Every try to solder to iron? Doesn't work.
And these are exactly what failed on me enough times to throw in the towel and go with Omega connectors. And yes, I have all the correct crimp tools for all the types of connectors used on the plane, including PIDG.
Helped a friend with his funky EGT temps. It had multiple crimp splices, dissimilar wire extensions, and a toggle switch to check bank A vs. bank B. All I can say is now with proper thermocouple extension wire, elimination of the extra splices, now using above noted EI splices, elimination of the switch (went to a dual needle gauge)... his two banks read as expected. Never did in the past. What exactly the problem was, I don't know. But there was plenty of poor practice that got removed.
From Omega (all things thermocouples)
