A tachometer using solid state and/or vacuum tube circuitry.
NSN 5905-00-605-6775
NSN 6645-01-012-0424
NSN 2925-01-027-1293
NSN 5895-00-001-9134
NSN 6685-01-391-6790
NSN 5950-01-139-3036
NSN 5895-00-861-9739
NSN 6685-01-424-0753
NSN 6220-01-193-1731
NSN 6610-01-486-3549
NSN 5965-00-110-3330
NSN 5915-00-456-0873