Any Ardunio nerds in here?

[CamaroAJ]

In my can never leave well enough alone venture with building my car I want to have a gear display on the dash. I'm wanting to use a Ardunio Nano to run a 8x8 LED dot matrix to show 1-2-3-4-5-6-7-N-R and ideally be a reverse ground input to my chassis module to signal turning on the back up lamps. GM uses a position sensor on the transmission already and its a 4 pin 5v reference sensor that appears to be a hall effect switch. Anyone here mess with Ardunio's that could help me learn them and make this setup work? From the looks of it one part of the sensor picks the left to right movement of the shifter and the other part picks up fore and aft movement of the shifter. At this point I haven't bought anything so I'm not 100% set on any particular Ardunio or LED board, but I have them in my Amazon cart already. The wiring part I can handle no problem, its the writing code for the module I have never done before.