Its in the tach itself. This is the one with the switch below it, one way it reads as a tach, flip the switch then its a speedometer. Ag Express said they couldn't fix it, from that I would assume its in the tach. When it happened I was actually watching it, was running about half throttle across the endrows, hit a small rut, the tach spiked clear to the right, and since then it will read at an idle up to about 1300-1400.

When switched to the speedometer position on the switch, it will still only read as high as it does as a tach.

Like I said, had a bad spot in the harness and either shorted it to a hot or something. If the previous owners would have searched a little bit, I'm betting that's what ate the last one as well. This one only had like 400 hours on it.