Hybrid Racing Coolant Temp sensor waterneck adapter fittingThis useful fitting allows you to insert a factory B D coolant temp sensor into the upper section of the K Series coolant system. This is required since the older generation gauge clusters can't understand the information being send from the K Series ECU. Thread the adapter in, screw the coolant sensor in and you'll have a working temp gauge! This adapter replaces the OEM idle air assist valve (not used on K Swaps) leaving you with the perfect spot to