Central also advanced to the final next week after winning their games in similar fashion.
They chased down 104 runs with about two overs left against Indians, before smashing an unmatched 170 in their 20 overs against Wanderers.
Geyser manager Karl McKnight said there was a strong rivalry between themselves and Central, so it would make for a good day of cricket in the final next weekend.
He said their stand-out performance came from Shayde Perham on Saturday, with the gloves and bat.
Central captain Rees Uerata said it was good to have all players back during the weekend, and they were fired up for the final this Saturday.