Split Loom Tubing
There is also split loom or corrugated tubing (shielding) used on the pack. A 1/4" ID split loom is used to cover the red tubing from the beam line to the brass elbow on the HGA (approx. 2 ft.) This 1/4" loom can also be used for the small boots on the injectors and on the resistors.
There is also approximately five feet of 3/4" split loom connecting the gun to the pack. This can also be found without the split. Some form of sleeve inside the loom may be needed to give the loom some form. Electronics wiring from the pack to the gun can be channeled through here as well.
The loom can generally be found at automotive suppliers or online sources.