I've got a 3510 that's 4 years old and the fuel gauge and
temp gauge only work part time. first thought it was a problem with the ignition switch, could turn it left and right several times and sometime they would work.
dealer said it was my problem, tractor was out of waranty
even though he said when I bought it that they would fix any problems that showed up, since he knew that there was a problem with the gauges when he sold me the tractor.