A tachometer using solid state and/or vacuum tube circuitry.
NSN 7035-01-045-7202
NSN 6240-01-651-2216
NSN 7035-01-533-7421
NSN 5960-01-536-6398
NSN 6105-01-182-5995
NSN 5950-00-113-7608
NSN 6135-00-299-6918
NSN 6685-00-863-1876
NSN 5895-01-524-9392
NSN 6610-01-545-2844
NSN 6650-01-252-8190
NSN 4140-00-906-1130