Originally Posted by LiquidX
You don't have to hook up the water lines. They just help against oil coking with hot shut offs (boosting, not taking it easy for the last few mins and then shuting off).
Yup, if the T-25 is temporary, not a permanent replacement I wouldn't worry about the coolant lines. I have a 84 conquest, and the 12a turbo is not water cooled from the factory... I just have to be reasonable about not running around boosting my brains out and then pull into a parking spot and shut off the engine, have to let it cool down for a bit first.
If you are leaving the T-25 on long term go ahead and get the water lines and hook them up, much more convenient that way.