There is different ways. If you don't think you NEED a warning switch, and I don't, I would just unscrew the rear line from the current distro block. Buy an inverted flare plug and plug the distro block. Then just get a coupler / union (3/16 inverted flare to 3/16 inverted flare) and a length of "universal" brake tube. It will have the proper nut on one end. You will have to do one of two things at the master end, and likely for both fittings (Or maybe Dr Diff comes with them?)
Either scare up the proprietary nuts that fit the new master, and re-flare the tube, or find an adapter for each master cylinder fitting which are different from each other
And remember.......the rear master port feeds the FRONT brakes
