M20x1.5 thread size allows compatibility with various motorbike models for installation of this oil temperature gauge.Designed as an accessory for monitoring engine temperature, it fits motorcycles requiring M20x1.5 threaded components such as the Haojue TR300 and X350.The gauge connects directly to the engine's oil system to provide real-time temperature readings, aiding in engine performance monitoring and maintenance.Compatibility Disclaimer: This is an aftermarket replacement part.Any brand names or model designations mentioned are used solely for the purpose of demonstrating compatibility.