This is a genuine GM AC Delco A/C pressure transducer coupled with our weld in fitting. Your PCM/ECM will use this to control your idle and your cooling fans while your A/C is on. This will make your LS/LT Swap work just like it did in its factory vehicle! This transducer takes a special fitting, which is supplied in the kit. It will need to be brazed or welded into your A/C system high pressure line.