There was a fatal accident a few years ago where a newly qualified FI(R) was instructing on an old PA28-140 with the trim wheel in the roof, a difficult to read ASI from the right seat, which stalled/spun shortly after take off killing all on board, I think lack of familiarity on type was given as a partial factor ( along with possible carb ice). maybe the old system where each type had to be tested by an FIC instructor (until with experience the FI was unrestricted) was a good idea.