AiM MyChron3 Basic - Manual (Page 19)

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To install the EGT thermocouple, please follow these instructions:
1. Make a 5 mm ( 0.2 inches ) hole inside the exhaust header;
2. Weld the little nut to the exhaust header in the place where the hole has
been drilled;
3. Screw in the nut the central part of the EGT thermocouple;
4. Connect the remaining part of the thermocouple and fix it to the exhaust
header by screwing the big nut.