This is a genuine GM AC Delco A/C pressure transducer. 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, we supply this transducer with a weld on fitting or a bolt in fitting for Vintage Air/Classic air equipped vehicles. Part Numbers ACK-001 and ACK-002.