A tachometer using solid state and/or vacuum tube circuitry.
NSN 5835-01-316-3255
NSN 5920-01-598-0219
NSN 5996-00-553-7348
NSN 5930-01-460-7351
NSN 6105-01-524-4842
NSN 5835-01-345-2556
NSN 6105-01-498-9759
NSN 5985-01-568-8030
NSN 6220-01-447-7841
NSN 6650-01-411-6292
NSN 5950-00-120-8497
NSN 5920-00-682-0500