A tachometer using solid state and/or vacuum tube circuitry.
NSN 5895-00-010-4045
NSN 5905-01-371-2064
NSN 5835-01-229-6964
NSN 5910-01-475-7843
NSN 5998-01-462-6215
NSN 5945-01-335-8233
NSN 6610-00-081-2365
NSN 6220-01-232-9947
NSN 5930-00-936-3926
NSN 6220-00-113-7868
NSN 5835-00-984-1233
NSN 5950-01-171-3536