Maruha Water Temperature Sensor Adapter + 78°C Thermostat · NA6 1.6L
Required package for running Maruha's 78°C thermostat on the 1.6L NA6 Miata. The NA6's stock water temperature gauge is notoriously inaccurate — it reads within a narrow band regardless of actual coolant temperature. This adapter allows installation of an accurate aftermarket water temperature sender at the correct location, giving you a real, reliable coolant temperature reading for the first time.
Package Includes:

Maruha Water Temperature Sensor Adapter — machined for NA6 1.6L coolant passage
Maruha 78°C Thermostat — larger valve (31.5mm dia.) and longer stroke (10mm) than OEM
Allows fitment of aftermarket water temperature sender for accurate gauge readings

Note: Aftermarket water temperature gauge or sender not included. These two components must be purchased together for correct 78°C thermostat fitment on the 1.6L engine.
Fitment: NA6 Miata 1990–1993 · 1.6L B6ZE engine only.
Made in Japan. Authorized Maruha import by Chikara Motorsports — North America's only official Maruha dealer.