Hobbs Did you convert your tubing size? or stay with 1/4 tubing. I stayed with 1/4 inch and ran in to a couple of issues, but as far as the brake sending unit goes most hydraulic s/u are 1/8 pipe size but you can get some which fit the 3/16 tubing size inverted flare fitting. Seams most brake line adaptor fittings are either inverted flare or AN with 3/16 tubing being more common than 1/4, when you get into the accessories. I ended up using a 7/16 x 24 thread IFF tee and a reducer from that to the 3/16 tubing size sending unit which is 3/8 x 24 thread.
Clear as mud? I was dizzy, trying to piece it together.
Might be easier to go mechanical.
Good luck in your quest.