mmnn,i agree,brake light sensor,blank it if you have too,it wont affect the operation.
as for you unions,why not just make some new brake pipes?,a flaring kit is around 25 quid (sealy) and use cunnifer for ease of installation...a satisfying job when done..and good to have that tool in stock for your next resto !!
keep up the good work,id love to help but your the wrong side of the pond....