Hourmeter included registers 9999.0 max
No other part numbers with same form, fit, and function found.
A tachometer using solid state and/or vacuum tube circuitry.
NSN 6610-00-433-3530
NSN 5895-01-066-6943
NSN 5985-01-015-0831
NSN 5965-01-317-6077
NSN 5985-01-551-0890
NSN 5915-00-045-6986
NSN 5996-01-322-3927
NSN 5965-01-172-5724
NSN 6150-01-213-1930
NSN 5975-00-023-8987
NSN 5835-01-478-9428
NSN 5920-01-003-8110