A tachometer using solid state and/or vacuum tube circuitry.
NSN 5925-00-105-8462
NSN 6110-01-319-7177
NSN 6685-01-385-2131
NSN 5960-01-040-3884
NSN 2925-01-424-0235
NSN 6150-01-294-3501
NSN 6650-01-014-7671
NSN 5895-01-397-8828
NSN 6685-01-371-7389
NSN 5990-01-084-8330
NSN 6150-00-236-5069
NSN 5935-01-028-0278