Re the turn signal, I’ve seen these on a number of old cars that did not come quipped with turn signals. You attach it to the steering column. Although you might not have enough room.
Former Owner of a 1981 Classic Roadsters Ltd. Duchess (VW)
2005 Intermeccanica Roadster
If you own a TDr and are not in the Registry, please go to https://tdreplica.com/forums/topic/mg-td-replica-registry/ and register (you need to copy and paste the link)