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Reviving this thread from a million years ago to ask why a threaded bung needs to be added for ECU temp sensor instead of just drilling a hole and tapping to 12x1.5mm?
If I had to guess the temperature sensor would crash into thermostat otherwise. You'd also need to put a flat on so the crush washer can do it's thing. Using a 1/8"NPT sensor would probably skip all that BS.