No other part numbers with same form, fit, and function found.
A tachometer using solid state and/or vacuum tube circuitry.
NSN 6220-00-712-1779
NSN 5960-01-024-7918
NSN 5965-01-565-6976
NSN 5965-00-106-3195
NSN 5990-01-174-6851
NSN 6320-01-538-3793
NSN 6240-01-496-9946
NSN 5999-00-852-2518
NSN 5975-00-877-2567
NSN 5996-01-348-2914
NSN 6135-01-388-2761
NSN 5910-00-911-8073