A tachometer using solid state and/or vacuum tube circuitry.
NSN 6110-00-271-9928
NSN 7035-00-403-5340
NSN 6130-01-131-9369
NSN 5930-01-366-5461
NSN 6610-01-497-5061
NSN 6145-01-497-4319
NSN 7035-01-080-8742
NSN 5975-01-608-7093
NSN 5930-01-578-9201
NSN 6320-01-172-6103
NSN 5935-01-429-1058
NSN 5855-00-757-5149