81-88 Rx7 Coolant Temperature Sensor (8569-18-510A)
81-88 12A & 13B Coolant Temperature Sensor (Under Oil Filter Stand)
Fits 12A & 13B, located under the oil filter stand.
Uses a crush washer and is a straight non-tapered thread.
You will also need the crush washer that goes under this temp sensor.
If your coolant temp sensor does not have a crush washer under it when you remove it then you will need this coolant temperature sensor.