A tachometer using solid state and/or vacuum tube circuitry.
NSN 2925-01-346-9522
NSN 5999-01-327-3672
NSN 5925-01-483-7604
NSN 6240-01-386-5952
NSN 6620-00-619-7769
NSN 6105-01-248-4673
NSN 6145-00-269-4271
NSN 7035-01-417-6261
NSN 5925-01-442-3792
NSN 6110-01-043-6218
NSN 6220-01-618-0948
NSN 5895-01-462-2038