Our Coolant Neck Adapter kit for all NA and NB MX-5 engines include a 1/8" NPT tapped hole for a clean and simple way to connect a water temperature sensor.
Comes in a clear anodized aluminium finish and a plug should you choose to block off the 1/8" NPT port. The adapter is grooved for your thermostat to ensure maximum seal and trouble-free operation in the future. You may choose to use a NPT to 1/8" barb fitting to serve other purposes such as a coolant feed line for a turbo.
Kit comes complete with hardware to make your install quick and easy. It is recommended to install the counterbore for thermostat flange toward the engine.