This is a replacement wiring harness for the SensorTap GM IAT/Baro Relocation Module. The harness includes connectors for the factory GM 4-wire MAF, the factory vehicle MAF harness, and the actual SensorTap module itself. This is an combined IAT and BARO breakout harness, and has a bare 2-wire pigtail to connect to your IAT sensor, with an additional 3-wire pigtail to connect your new baro sensor.