I found a post from
PirelliOllie covering this while I was looking for something else. Well worth a read.
https://www.fiatforum.com/showthread.php?p=4210233
Don't know if this will work on pre-Eco 1.1, but it seems that all functions apart from the outside air temp work (that needs the sensor in the passenger mirror) but apparently the display for that can be turned off in
MES.
Might have a go at this one day if I come across a dash with fairly low mileage - my spares car dash has about 100k more than our 1.1 so not going to use that one.
If anyone feels like doing a guide...