A tachometer using solid state and/or vacuum tube circuitry.
NSN 6320-00-538-2132
NSN 5905-01-226-0728
NSN 6135-01-419-5574
NSN 6145-01-387-3495
NSN 6320-00-284-1524
NSN 5985-01-578-0028
NSN 6110-01-151-8110
NSN 5960-01-170-4057
NSN 5945-01-442-7188
NSN 7035-00-135-4758
NSN 4140-01-274-1942
NSN 5855-01-117-7207