Hi I also have a ducato with a temp guage problem it's been in the garage for 5 weeks they have contacted fiat who do not want to know it has done 13,000 miles so I guess it's now my problem . The fault is when you turn on the ign the guage goes up to half way the drops to zero . I saw the rep at the NEC in feb he said there is no problem but I found 3 write ups about this same fault if you have a fix let please let me know as I am now e-mailing fiat every day but as yet they have not come back to me this must be the way fiat treat us after we have bought the van ?????