If you were looking at the model from Fuel saver it is easier than it looks. when you decide to get one I wrote another procedure I use for installation. I can send it to you when you are ready for it. Several of my clients had problem with the one's from Mike so I made with pictures that shows the wires being cut and routed to the matching connectors.

once you've identified the signal wire it's downhill from there. Bu the way you can make your bubbler from a 2" PVC pipe and end cap. The system in the photo is the one installed in my 1985 300SD turbo 3.0 liter. You can see the clear tube is the secondary bubbler, the solid white is the primary bubbler.