A tachometer using solid state and/or vacuum tube circuitry.
NSN 5950-00-147-0745
NSN 5965-01-413-2938
NSN 5998-01-442-8630
NSN 5985-01-519-5952
NSN 6610-01-391-6781
NSN 6105-01-441-9312
NSN 5960-01-385-4333
NSN 6130-01-398-2519
NSN 5990-00-733-2342
NSN 2925-01-053-5697
NSN 5835-00-106-2120
NSN 5945-00-406-8194