So far, 12 of the 20 high pressure engine companies have been identified. Engines 6, 20, 20-2, 27, 27-2, 30-2, 30-3, 32 (maybe)?, 33, 33-2, 72-2, and 203.
Maybe one of the apparatus experts can suggest some others. (G-Man?)
FDNY high pressure companies were identified as engine companies...