Brothers , Just to add my 2 cents. I have installed the lower version of Android Panel (1GB RAM, 16GM ROM) and it is working like charm. It is equipped with Android Go (Android version for Lower end devices ) that it self consumes less memory. I am a Mobile Developer (iOS and Android) and tested this device with many test cases and regression testing. This panel passed each and every test. I have also customized it with my own developed themes and also played with GPS and OBD2 interface. the only downside of this panel is the sound quality, for Bass lovers like me, It requires an additional amplifier , I don't know what is the sound quality of higher end panels.
So I would suggest using the lower end ... having 2/4 GB of RAM is waste for Dash Panel. If your intention is not to play games or use heavy graphics ... then there is no need to spend extra amount . Instead you can have better speakers or an amplifier