Holley Direct Mount Fuel Pulse Damper Type:6AN ORB Extended Range 40-100 PSI Two additional programmable LEDs are

Two additional programmable LEDs are included in the enclosure and are fully programmable

If you're doing a K24 setup

10 AN O-ring Inlet

4L FA24 engines

Holley Direct Mount Fuel Pulse Damper Type:6AN ORB Extended Range 40-100 PSI Two additional programmable LEDs areFuel pulse dampers act in tandem with the fuel pressure regulator to further control the fuel pressure in an EFI system. They act to smooth out the pressure pulsations caused by the injectors opening and closing as well as the fuel pump operating. These pulsations happen so quickly that in many cases they can't be identified with an analog gauge but can cause issues with fuel delivery to the engine Features: Engineered to stabilize pressure pulsations