Just foun this "all-in-one" computer that looks very interesting and it can be used to read a plethora of sensors. Not sure If I'm allowed to post the links, so just google for UTCOMP PRO
I'm curious if someone fitted one of these on a xantia, because I'm thinking about doing it

Basically it can display readings from all sensors, and also works as a trip computer. I like that it comes in green and with some work, it can be made to look OEM on a xantia.
Thank you