A tachometer using solid state and/or vacuum tube circuitry.
NSN 6650-00-213-7065
NSN 5990-00-024-9985
NSN 6240-01-012-2180
NSN 5990-00-212-4316
NSN 5998-01-578-5502
NSN 5960-01-070-3655
NSN 6110-00-087-0227
NSN 6650-00-190-5158
NSN 6320-00-823-2015
NSN 5925-00-211-4313
NSN 5915-01-406-0778
NSN 6130-01-065-0541