A tachometer using solid state and/or vacuum tube circuitry.
NSN 5925-00-188-8678
NSN 5985-01-608-4446
NSN 6240-01-258-5829
NSN 6220-00-376-1538
NSN 5895-01-543-0778
NSN 5910-00-604-0334
NSN 6320-01-371-3047
NSN 5905-01-412-8600
NSN 5945-01-305-5203
NSN 6135-01-069-2482
NSN 5915-01-186-9384
NSN 5910-01-157-9946