A tachometer using solid state and/or vacuum tube circuitry.
NSN 6110-01-125-9723
NSN 5905-01-649-7497
NSN 5935-01-324-6624
NSN 5985-00-277-7371
NSN 5915-01-576-2602
NSN 5910-00-270-6876
NSN 7035-00-803-3056
NSN 6105-01-088-8133
NSN 6620-00-316-2167
NSN 4140-01-449-4193
NSN 5999-00-269-5320
NSN 5855-01-187-2293