Don't be afraid of wiring it is just a case of knowing what goes where. check the wiring diagram and see where the wires for the indicators go. Not much help without showing you I know but please check the diagram as it only applies to a small bit.
I too had a similar problem and in my case it was the master cylinder. I also had no noticeable fluid loss. Good luck, simple system there aren't that many things to go wrong.
Not fixed yet but while behind the dash found the cards from the factory covering the individual requirements for the vehicle. Requests for electric washers being one. Also for hardtop in colour sand. Has highlighted how original my landy is. This is dated 6 sept 72.