AiM MyChron3 Basic - Manual (Page 18)

18
Installing the EGT thermocouple
The Exhaust Gas Thermocouple ( EGT ) should be positioned inside the exhaust
header pipe at a distance of 150 mm ( 5.9 inches ) from the exhaust port.
The following drawing shows a correct installation of the EGT thermocouple.
It is recommended that the probe be inserted between 25% and 50% inside the
exhaust gas header.