Can Tacx Flow head unit work with old (2002) Basic frame/brake?
As suggested in a comment on the question, the load generator for the Tacx Basic in the early 2000's was the same load generator used across the entire Tacx ergometer line. The Basic, the Grand Excel, the Flow, and the I-Magic all used the same load generator, so the head units are interchangeable. The capabilities of the Basic can thus be "upgraded" by switching to a Grand Excel or I-Magic head unit (the Flow replaced the Basic in the Tacx line in 2004 or 2005 and, except for a larger screen and slightly easier calibration procedure the models are equivalent).