A tachometer using solid state and/or vacuum tube circuitry.
NSN 5950-01-245-1216
NSN 6620-00-189-9444
NSN 7035-01-145-5059
NSN 6105-00-772-5910
NSN 6145-01-309-1604
NSN 5950-01-634-0677
NSN 6130-00-196-5292
NSN 5855-01-334-6594
NSN 6685-01-326-7020
NSN 6620-00-185-1671
NSN 5965-01-511-5392
NSN 5910-00-880-6080