A tachometer using solid state and/or vacuum tube circuitry.
NSN 5910-01-493-1625
NSN 5998-00-786-7020
NSN 5950-00-533-7188
NSN 5905-00-498-2111
NSN 5990-00-985-1334
NSN 2925-00-099-4030
NSN 5950-00-724-6381
NSN 5996-00-127-8824
NSN 5915-01-306-1346
NSN 6620-01-286-2204
NSN 6650-00-170-5095
NSN 5835-01-103-9110