I got finally some time on my hands so I build up my monitoring setup further more.
I took a panel in my car and modify it to this:
And mounted in the car with an 11pol connection, everything works perfect now, my old leds where dieing on me every time so I had to use a diode on the pump and the solenoids. For 5volt on the computer display I used a voltage 7805 regulator and it works like a charm, display has 7 different colors so I can match it with the car.
Here the build-in station:
