A tachometer using solid state and/or vacuum tube circuitry.
NSN 5960-00-771-2824
NSN 5945-01-072-0423
NSN 6685-00-184-3894
NSN 5985-00-823-1112
NSN 6685-00-202-5233
NSN 6105-01-396-5634
NSN 4140-00-449-7345
NSN 5990-00-281-4164
NSN 5950-00-500-7127
NSN 5965-01-327-9234
NSN 7035-00-631-3782
NSN 5920-01-167-5884