On Sunday, November 24, 2019 at 7:36:44 PM UTC-8, soaringjac wrote:
...Y shape rather than a T?

These days, soaring instruments primarily measure pressure and rate of pressure change, for which the shape of the connector is pretty much immaterial.

If you are in a flight regime where the instrument tubing has so much flow that the connector shape does matter, you should probably be looking outside, or looking for your parachute D-ring, not at the instruments.

--Bob K.