Ok so now that I am being told to also include a gear indicator, Just so I don’t have to open another thread and hope that someone reads it and replies to it, I will ask here. How would I wire this https://www.sparkfun.com/products/10103 with a pro mini powered by 9V(will be using a regulator but still a little confused on which GND pin to use when the 9V is soldered into the RAW pin). And I am assuming I would need to use the 3.3v version of the Pro Mini, Correct?
So now I have to make all of these projects fit into one assembly on the wheel( a Pro Mini will be in the housing along with the Bar graph breakout, a Neutral LED, the display driver, the display itself and the huge cable used for out MIL-SPEC connector…I hate having people wanting this much from such a small place, especially when they don’t realize how each project needs a separate board to do it and expects it to be really easy to do…
How would I go about making a circuit to sense when there it power put into it, when the paddle is hit(not sure how long it will be on but it will be as fast as fingers tense and relax when under the influence of adrenaline) but not affect the voltage that goes to the pneumatic solenoids for the shifter? I think what I am asking for is basically a voltage reference but I am not 100% sure if that is what is needed or what, and if so what is a very efficient way to do so? I will look into code a little bit later as I am trying to also focus on classes.
Thank you for helping in advance, if I am lucky enough to get more help that is 
:P.