A tachometer using solid state and/or vacuum tube circuitry.
NSN 6135-01-069-2482
NSN 6130-00-612-7161
NSN 5925-01-064-4097
NSN 2925-00-449-2478
NSN 6110-01-531-9770
NSN 5925-00-243-1654
NSN 5975-00-988-8689
NSN 6145-00-906-2029
NSN 5895-01-233-0683
NSN 5945-01-305-9735
NSN 5975-00-682-0577
NSN 6620-01-270-0478