A tachometer using solid state and/or vacuum tube circuitry.
NSN 5895-01-261-9960
NSN 6685-00-900-4246
NSN 6645-01-018-7664
NSN 5960-01-548-4896
NSN 5996-01-459-0585
NSN 5905-00-238-7212
NSN 5910-01-230-9264
NSN 6220-00-284-3220
NSN 6145-00-280-8488
NSN 6645-00-599-8890
NSN 6150-01-503-0272
NSN 5855-01-278-8922