Haven't found anything on Uboats yet. But, many of the technologies were the same.
The Fleet Type Submarine, Navpers 16160, is the first in a series of submarine training manuals that was completed just after WW II. The series describes the peak of WW II US submarine technology. June 1946
http://www.maritime.org/fleetsub/elect/chap11.htm
Quote:
A. MOTOR ORDER TELEGRAPH SYSTEM 11A1. Description. The motor order telegraph system consists of 2 separate electrical circuits. The starboard circuit is designated 1MB and the port circuit, 2MB. Electrically both circuits are identical. The system is operated on 115-volt, 60-cycle, single-phase, alternating current. Each circuit receives its supply from the a.c. bus of the I.C. switchboard through fused switches. The purpose of the motor order telegraph system is to transmit electrically any desired orders for the direction and speed of the propellers from the transmitting stations located in the conning tower and control room to the maneuvering room and to repeat those orders back to the transmitting station from the maneuvering room.
The circuits are controlled through rotary switches on the action cutout switchboard. One switch selects the conning tower or the control room as the transmitting station for both 1MB and 2MB circuits. Two more switches select either the conning tower, control room, or both, as the receiving station for the repeat back orders from the maneuvering room. One of these 2 switches is for the 1 MB, the other for the 2 MB indicators.
The conning tower and control room units consist essentially of a type "A" transmitter and pointer, a type "M" indicator and pointer, 2 sets of contacts for bell-ringing circuits, and necessary operating gears. The assembly is mounted in a case.
The transmitter is operated by a knob type handle fastened to a shaft on the front cover of the instrument. This shaft is connected to the transmitter rotor by means of a positive engaging clutch. A star wheel mounted on the transmitter shaft holds the transmitter in the desired position by means of a spring loaded main bell contact actuating lever. This lever also operates the contacts for the bell signal at the indicator station. The bell signal rings whenever the transmitter is being moved from one position to another. Auxiliary contacts for the bell signal are operated by a push button on the cover of the instrument. They are connected in parallel with the contacts operated by the star wheel. The auxiliary bell-ringing circuit is energized at any time the push button is operated. The indicator pointer is connected directly to the rotor of the indicator through an extension shaft. The maneuvering room instruments are similar except for an additional mechanism consisting of a cam mounted on the transmitter shaft which operates a contact for wrong direction warning. These contacts are connected with contacts on the reverser levers of the main control cubicle. If the reverser levers are moved in a direction opposite to that indicated by the transmitter pointers of the maneuvering room instruments, a visual and audible signal informs the operator of the error.
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I'm working on the Rudder Angle Indicator System now and will post it shortly.