I'm working on attaching to a thermocouple harness that had six 16AWG chromel wires and one 12AWG Alumel. The alumel would T off with each of the chromel wires to make a pairing and so the common was the same for each to give six measurements around the engine. I need to make a cable that will hook into this and go off to my box to do measurements. I'm having a hell of a time finding 12AWG of any flavor of type k thermocouple wire and 16AWG is possible but rare so expensive.
My question is would dropping the gauge to 16AWG or 20AWG for my cable affect the measurement significantly? It's only about 10ft of cable that I need and from what I've read the change in gauge adds about less than 10ohms/1000ft so that shouldn't be affected too much. Is there anything else to consider or avoid for this setup?