[Alfajay]

Gordon Raymond had asked: "If you are using an earlier pump set up for the mechanical tach drive, how are you driving it from a 2 L? Has the intermediate sprocket been swapped out to an earlier one with the tach drive gear on the end, or have you pulled the gear from an earlier mechanical tach intermediate sprocket and added it to the 2 L sprocket to allow an earlier water pump?"

Gordon - Alfa put the mechanical tach drive into its engines well into the 2L era. So, most used 2L engines around have the capability to support a 101 tach - certainly all 2L's from the Spica era.

I guess you are saying that the later engines - those from cars with electric tachs - lack the worm gear on the end of the 2:1 reduction gear between the upper and lower timing chains. And, have a block-off plate on the waterpump where the tach drive used to go. But, an enterprising Alfisti could use parts off an older car to restore mechanical tach operation.

Fans - I would try to find an electric that fits in front of the radiator. Even if its diameter is less than the mechanically-driven fan, it still might move more air than a skinny blade mech fan with no shroud. As long as the 101 radiator has been re-cored with a heavy-duty core, it should cool the 2L pretty well without a lot of airflow. And, you only need a fan when the car is standing still - if you never stop, you don't need one!