This simple one wire sensor is needed in all K-swapped EF/EG/EK/DA/DC2 chassis’s for the temp gauge operation. It allows the coolant temperature reading to be properly displayed on OEM analog dash gauge clusters for these ‘legacy’ vehicles.
Pick up a K-Tuned coolant temp sensor adapter while you’re at so this sensor can easily be installed in the K20A/A2/A3/Z1 factory upper coolant neck!