This is a replacement harness for your FASS system on your 05 - 16 Dodge Ram with a Cummins. This also fits on a 98.5 - 04 Dodge Ram if it had a retro-fitted fuel pump before you installed the FASS.
I recently had to replace my harness for my fass 165 gph on my 2008 Dodge Ram. The company gave me a call to make sure that's the harness I wanted. Good on them!