This is how to make an Arduino Racing Gauge for Sim Racing.
Step 1: Features
This is a racing and supercar inspired gauge, it is designed to show the RPMs graphicaly drawing an RGB bar round the meter.
The example takes the value from a potentiometer, but it can be mixed with my last instructable(SimRacing Display 1) to get the RPM data from a game like Assetto Corsa and display it.
Step 2: Materials Needed
You only need an Arduino MEGA and a MCUFriend TFT 3,5" Shield for UNO and a 10K potentiometer.
It rounds moreless 35-40€ all.
Step 3: Code and Building
This is as simple as attaching the MCUFriend to your MEGA, and a potentiometer to the Analog 15 pin of the Arduino.
You can download the code here: MEGA