***** So basically you want to go here: theairtacticalassaultgroup.com/forum/showthread.php?t=3887 in the first post you find the class for c# to read the data; basically you copy and paste in your program. then in a timer you take the data with something like that: GameCommunications Comm = new GameCommunications(); double Rpm = Comm.GetParameter(GameCommunications.ParameterTypes.I_EngineRPM, 0); when you have the variables you can feed them to arduino via serial. about the gauges there is a good amount of tutorials and projects: guy.carpenter.id.au/gaugette/2012/01/05/what-is-gaugette/

***** On the second monitor you can see the program that I made in C# that collect the data sent by the Modded Game through the Devicelink( the original one does not send data; so you Need the TF Mod). The program connects to Arduino via Serial (Usb); on Arduino the data are collected and utilized to manage the gauge stepper motor. Are you more interested in the hardware part (the gauge) or in the software?