A tachometer using solid state and/or vacuum tube circuitry.
NSN 6150-01-010-3400
NSN 5985-01-140-1559
NSN 6685-00-273-8733
NSN 6685-00-902-4921
NSN 6130-00-266-7496
NSN 6240-01-450-3227
NSN 6150-01-634-0575
NSN 5855-01-555-3354
NSN 5960-01-383-6262
NSN 6220-00-100-6276
NSN 6610-01-431-5447
NSN 6130-00-133-1598