Danny, it seems that some schools went beyond removing/taping over the ASI:-
By 1943, there were 18 schools in the CFTC
using the PT-19 including two British Flying
Training Schools and the Women Air Force
Service Pilots training activity at Avenger Field in
Sweetwater, Texas. The instrument panel included
an air speed indicator, altimeter, clock, vertical
speed indicator, and turn and bank indicator,
though one former cadet that trained at Chickasha,
Okla., remembered that all instruments except the
oil pressure and cylinder temperature gauge were
taped over in order to learn to fly “by the seat of
one’s pants.”
This is from "USAAF Primary Trainers" :-
United States Army Air Forces Primary Trainers, 1939-1945 | Stephen Craft - Academia.edu