Can you give me some examples of how Sai Baba showed his devotees his connection to Lord Vitthal?

Chapter 4 provides several examples of Sai Baba's profound connection to Lord Vitthal. In one instance, when Das Ganu was organizing a Name-week (Saptah) and wanted assurance that Vitthal would appear, Baba placed a hand on his chest and promised that Vitthal's form would appear, provided the devotee was full of faith. In another beautiful story, Kakasaheb Dixit had a vision of Vitthal during his morning meditation. Later that day, Baba asked him if he had met "Vitthal Patil," confirming the vision. The experience was further validated when a seller arrived with pictures of Vitthal, one of which was an exact replica of the form Dixit had seen in his vision.