How do I add water and diesel sensor?

[SBZ]

to answer my selfe:

I added the sensors to an arduino with analogtoserial read.
The serial output goes into node-red and further to freeboard.
My next challenge is to forward this to NMEA2000 so I can read the datas on my Raymarine.

How did you get the Arduino data into the Openplotter RPI?

Chris