When doing a LS Swap and using A/C you need to integrate the GM pressure sensor so you can bump the idle and operate the cooling fans when your A/C is on.  This thread in fitting will enable the use of a GM Sensor that will send your ECM or PCM the information it needs to operate your Swap properly when the A/C is on.

This BRASS fitting is to be installed into the HIGH SIDE of your A/C System

If you are looking for a Weld in fitting and a GM pressure sensor purchase BP Automotive part number ACK-001

If you are looking for a crimp in fitting and a GM pressure sensor purchase BP Automotive part number ACK-002

If you would like to purchase just the Binary Switch purchase BP Automotive part number ACS-002

If you are looking for a crimp in fitting with a 7/16 Port for a Binary Switch purchase BP Automotive part number ACF-006

acf-002 ACF-002 thread in fitting m10 M10