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Hi Bill; Ernest is correct in that the error introduced at the junction will cancel each other as long as carefull attention is paid to keep everything the same at both junctions. However the junction created when you switch to copper is called the reference junction and has special importance. More info can be found here... http://www.omega.com/techref/thermoref.html If you are unfamiliar which thermocouples and want more good info, then this link is excellent. http://www.omega.com/techref/themointro.html It also has links to other good info on various aspects of T/C's In my application I used a bundled T/C extension wire to go from the D-sub connector on the EM2 to a small sealed junction box located beside the engine. http://www.omega.com/pptst/4KX_MULTIPAIR_CABLE.html I used a 4 pair "K" type stranded and a 4 pair "J" type stranded cable. They are flexible and I was able to solder to the D-sub connector. This keeps the reference junction at the EM2. In the junction box beside the engine I have a terminal strip where I can connect individual T/C wires. Some of these are permanent, such as the "K" type which are used for the EGT & TIT, but the "J" types I have moved to various locations while experimenting. S. Todd Bartrim C-FSTB Turbo13B RV9 http://members.cox.net/rogersda/rotary/configs.htm#C-FSTB http://www3.telus.net/haywire/RV-9/C-FSTB.htm -----Original Message----- From: Rotary motors in aircraft [mailto:flyrotary@lancaironline.net] On Behalf Of Bill Bradburry Sent: Wednesday, October 11, 2006 4:41 AM To: Rotary motors in aircraft Subject: [FlyRotary] Musings on the EM-2 connector P1 I have been slowly building the harnesses for the EC and EM-2. I now have arrived at the P1 connector on the EM-2. This supplied connector is a solder connector to be connected to J and K thermocouple wire....Hmmm. You can not solder this wire....Hmmm. I have considered buying a crimp connector, BUT there is going to be a transition joint from thermocouple wire to copper at some place inside this apparatus no matter what you do. So what I am going to do is make up copper jumpers that solder to the connector and terminate with crimped ring terminals for connection to the thermocouple wires. The connection will be inside the panel and I think will introduce a minimum of error in the system. Any comments or a better way to think of this? Bill Bradburry -- Homepage: http://www.flyrotary.com/ Archive and UnSub: http://mail.lancaironline.net/lists/flyrotary/