The goal is to shift twice at the same rpm. The car is uses a grid, and a b&j. The grid supplies 1 programmable output signal that can be used for (anything) shifting. That programmable out will be triggered every time the rpm reaches the set point. If the two air solenoids are both wired to the same output, the car would shift both gear sections at the same time skipping 2nd gear. So how does one separate the two shifts. The second question is how do you keep the air pressure constant when the signal is removed after the shift. The he signal that comes from the grid is just supplied when the rpm is above the set point. When the shift takes place, the rpm would drop below the set point, power is then removed from the output of the grid, and it would vent the solenoid and the transmission goes into neutral.