Non-electrical savvy person question
connecting 2 and 3 will make it run fast in one direction.
connecting 1 and 3  will make it run slow in the opposite direction.
connecting 1,2 and 3 might make it run even faster in the first direction or it might be bad.
Any connection that doesn't include 3 will cause it to stop.
I cannot tell from the diagram which of the above options the original switch provided.