Thermocouple is K as original ones.
I moved the probe on a different channel, and saw the same.
I think I don’t get your suggestion of wrapping ?
Anyway, the conclusion is that they are not proper for my set up.
I came across this potentially useful table which shows thermocouple types and the connector colours
Unfortunately there is just the right amount of ambiguity 
However, in GA, it tends to be just J or K type.
I am now looking into the topic of TIT/EGT probes.
I have a JPI Slimline TIT instrument.
In their FAQ, in the section about probes, JPI themselves state that:
– Alcor probes are OK for JPI EDM devices, as long as the same type is used (which will most likely be K – with red and yellow wires); I understand that to also include probes from EI and other manufacturers
– units manufactured after 1985 use grounded probes (which are less expensive and allegedly last longer)
– to see if a specific probe is grounded or ungrounded one should measure resistance between the wires and between the yellow wire and the probe body; grounded will show zero resistance, ungrounded will show between 5 and 10 ohms
The JPI FAQ on probes is here: https://www.jpinstruments.com/FAQCategory/probes/
A local PDF of the page made on November 12, 2022 at 2125 UTC is attached for reference: 221112_JPI_FAQ_Probes_pdf
grounded will show zero resistance, ungrounded will show between 5 and 10 ohms
That would mean the probe contains a resistor.
Not impossible but I have designed various thermocouple instruments and have never seen that.
Is the Q on probe interchangeability?
