After a longer than usual storage period due to covid, the speedo, rev counter, fual and temp gauges weren't working on my 2008 Ducato 3.0 based moho, although the rev counter did eventually burst back into life. I checked the cluster PCB for solder cracking as I'd had this on a Ford Focus which are notorious for this, and is a simple solder repair if you have a steady hand, but I didn't find any defects on my moho cluster. So, I sent the cluster off to Cartronics who've fixed it and on it's way back to me (great service - same day turn around).
Cartronics say that the problem is that Ducatos, and it's sister vans, are daily vans and the gauge motors don't like being left idle for long periods. Consequently, the clusters Cartronics repair are invariably from moho's and because of this they're thinking about reducing their lifetime guarantee to just six months because, as they say, the gauges will eventually stop working again if the vehicle is not driven regularly. So their preventative advice is a weekly drive around the block.