A tachometer using solid state and/or vacuum tube circuitry.
NSN 5985-01-228-9823
NSN 5930-00-983-4092
NSN 7035-00-337-8745
NSN 6645-01-494-3845
NSN 6145-00-112-9476
NSN 5996-00-415-1556
NSN 4140-01-400-3610
NSN 5960-01-384-1300
NSN 6620-00-400-1099
NSN 5960-01-512-0233
NSN 6650-00-473-1259
NSN 5935-00-177-7950