Includes thermocouples, wiring harness, and connector to interface with diagnostic kit (one per truck). Installation of the thermocouple kit is quick and diagnostics can be performed in the field or in the workshop. Thermocouples and wiring harnesses can remain installed on the engine for future diagnostics. The exhaust temperature thermocouple kit requires a diagnostic kit and Caterpillar Electronic Technician (ET) software to read engine cylinder temperatures.