A tachometer using solid state and/or vacuum tube circuitry.
NSN 6220-01-284-3963
NSN 4140-00-289-9263
NSN 5925-01-469-6068
NSN 6220-01-465-5401
NSN 6220-00-949-0024
NSN 6130-01-283-3413
NSN 5999-01-477-9201
NSN 5895-00-923-4955
NSN 5945-01-410-7778
NSN 6645-01-356-3105
NSN 4140-01-500-1187
NSN 5999-01-384-4852