A tachometer using solid state and/or vacuum tube circuitry.
NSN 5855-00-411-7480
NSN 5855-01-079-8716
NSN 5895-01-114-0718
NSN 5905-01-357-6113
NSN 6685-00-118-3625
NSN 5835-01-490-9751
NSN 6645-00-868-1246
NSN 6145-00-983-1701
NSN 5930-01-555-6963
NSN 6645-01-547-5748
NSN 5999-01-168-9730
NSN 5920-01-604-9045