CHT - Cylinder Head Temperature ThermocoupleDescription Downloads The FuelTech Cylinder Head Temperature Thermocouple offers faster and more accurate temperature reading for engine head temperature. The ring tip gives the sensor a lower thermal inertia and easier way to bolt to the head, allowing faster reading during temperature variation of the cylinder head. Temperature range: 32F to 2200F Wire lengths: 42" The K Type Cylinder Head Temperature Thermocouple Probe is compatible with the EGT 8