A tachometer using solid state and/or vacuum tube circuitry.
NSN 5910-01-023-0078
NSN 5945-01-053-4331
NSN 5835-00-830-6340
NSN 6220-00-803-4610
NSN 5905-01-224-1177
NSN 6110-01-388-3803
NSN 5855-01-346-7682
NSN 6610-00-080-8839
NSN 6650-01-192-9075
NSN 5925-00-415-2286
NSN 5996-01-109-0230
NSN 5998-01-242-0007