The second indicator is now working. Somehow I have a feeling that I'll end up doing this again.
Once I have changed the oils again I will see if I can find a competent upholsterer, who won't stuff up my single seat cover. It needs to be riveted onto the metal base. Then I'll need to tweak the rack where it sits on the cross-member that holds the rear fender. I am still not sure how I'll do it. I want it to look right.