pjvr99, we did the swapping of the Indicator and amplifier leads before as what you suggested with no effect to the control problem. In fact, we have 2 indicators on our test console, one reading the TIT and the other reading the temperature to the TD Amp. Both reading the same with difference less than 3°C. Only thing that I am concerned is when we did the TD Cal. we observed that the Fixed Phase voltage of 90 V for the Bendix Amp but only 80 V for the Reven. I am not too sure this will affect the motor function on the TD Valve but again the limits under the test procedures is acceptable as long as it is over 75 V. What we intend to do during the next engine test is to measure the output voltage to all the coils (Motor and Generator) of the TD Valve via the jumper connection for the J3 lead that we fabricated and compare the difference between the Bendix and Reven Amp as I am also thinking that if the voltage is too low, movement of the plunger inside the TD Valve may be affected due to sticky gears and bushings.