I can't blame the dealer or AGCO/Massey for this MINOR problem. It worked fine for the first couple months. I don't yet know if it's a bad connection in the wiring, a bad gauge or dash circuit board, or something else.
All manufactured items today are a sum of the parts, and all those items are purchased from an outside company. No one builds the complete unit.
I've spent my life in trucking. One job was hauling parts for Cummins. Raw castings came from overseas, most small parts (fasteners, spacers, clips, covers, fittings, sensors, etc.etc.) came from vendors here in the U.S., and the machining was also done here, almost all of it outside Cummins plants, where they basically just assembled the parts, painted, and test fired. If one of those parts is fails, it's not really Cummins fault, it's the vendors quality control.
I would guess that the majority of failures today are in the electronic parts, and there's lots of competition in that area, mostly overseas, and cost is more important than quality to some of them.
It's also far more difficult to control quality on electronics. You can see hard parts and usually know if it's not right. Electronics may test fine with a weak internal part, but will fail when put in use.
The real issue is dealer/MFR support when issues occur. Since my issue is MINOR, I don't expect the dealer to put me at the top of the list of work. The tractor is usable, I think I will know if it overheats, and the dealer is also responsible for lots of farm equipment, which may be far more important at the time.
The tractor is currently at the dealers. I haven't heard from them, but it's only been a couple days. I mowed the lawn the day they picked it up, so I'm good for a week or so, but I told them if my grass needed mowing they better bring me something to mow with. Dealer said they would, but didn't foresee my repair taking that long.
