A tachometer using solid state and/or vacuum tube circuitry.
NSN 5855-01-003-7102
NSN 5920-01-601-6787
NSN 5910-01-592-1459
NSN 6220-00-151-4436
NSN 6145-01-461-8062
NSN 5930-00-312-1213
NSN 6150-01-400-4211
NSN 6610-01-487-2625
NSN 6220-01-351-0183
NSN 5930-00-244-2742
NSN 6110-00-863-3855
NSN 6240-01-415-5581