Quoting keydiver:
If the chip has BOTH NLTS and the stutterbox launch rev liters, you need the clutchwire to get either of them to work. If you need to build your own clutchwire, here is the diagram, except the GVR-4 clutchwire you cut is black/red striped:
I guess my chip doesn't have NLTS then cause my stutterbox works fine and I never installed the clutch-wire.