not sure if this is the right section pretty new to this site but hopefully someone can help me out. i bought an AEM water temp gauge because my oem one really doesnt work well and i wanted something more accurate since its my track car. so the sensor that comes with the gauge from AEM is a standard 1/8th thread pitch and when i called them to see if they had a metric size they said i should call up summit racing and get an adapter. now the question is what size is the oem thread pitch? 12mm? 14mm? anyone know? any help is appreciated.

 

its a gsr head if that makes a difference