I am having issues with the 2 CHT readings on a Rotax installation giving me high readings. It seems as if the readings fluctuate rapidly up and down. I did put an analog gauge on for testing purposes and the two readings do not agree at all. I never went above 180 degrees on the analog gauge but I fluctuated between 230 and 300 degrees on the 5500 display. I have checked all my grounds and all seems OK. What am I missing? It has also done it with the oil temp a few times but not as much.

I tried to use the shift setting on the calibration page and I can shift the first sensor but it never changes the second sensor. Is there a trick to get the second one to shift?