No other part numbers with same form, fit, and function found.
A tachometer using solid state and/or vacuum tube circuitry.
NSN 6610-01-424-5577
NSN 6645-01-263-5481
NSN 5990-01-417-4402
NSN 5905-01-388-8231
NSN 5975-00-315-8369
NSN 7035-00-104-7613
NSN 5999-01-401-5322
NSN 7035-01-459-8268
NSN 6685-01-197-3838
NSN 5835-00-904-6272
NSN 5996-00-158-5781
NSN 6620-01-183-5329