Interim coach Samy Komsan handed Tau a start in the attack alongside Ahmed Radwan and Mohamed Sherif, while Ali Maaloul also returned at left-back.
The Red Devils found the breakthrough as early as the 12th minute when a poor clearance from Abdel Ghani fell at the feet of Sherif, who made no mistake from close range.
The lead should have been doubled four minutes later when Zamalek goalkeeper Mohamed Awad thwarted Mohamed Magdy from close-range to keep the score-line to just one goal.
Zamalek, meanwhile, had a couple forays into the final third during the opening 45 minutes but they struggled to forced Al Ahly goalkeeper Mohamed El Shenawy into any serious saves.
The visitors threw on veteran midfielder Shikabala for Omar El-Said at the start of the second stanza, while Tau's evening only lasted 45 minutes as he was replaced by Hussein El-Shahat.
The decision to introduce Shikabala paid dividends on 69 minutes as the midfielder did well to pick out Achraf Bencharki, who nodded home the equaliser, before he gave his side the lead six minutes later with a close-range finish.
A crazy late spell in the half saw Al Ahly equalise with 10 minutes to go, with Salah Mohsen nodding home from close range after getting on the end of Taher Mohamed's cross.
The visitors nearly snatched the win in the final minutes as Emam Ashour rattled the frame of the goal, as the two sides left with a point each on the night.