During a normal crusie flight the N2 Tach needle went to the top of the glass and would stay there. After landing I tried vaious resets and nothing helped. Power off, avionics off, circuit breaker out etc. As soon as power was applied to the needle went to max reflection, off the chart to the top of glass.
With power off or circuit breaker pulled it would go to bottom N2 Gauge.
Let it sit for two days, fixed itself. Maintenance was unable to find anything.
Anybody have seen this and if so did you replace the N2 sensor or is there something else we are not thinking off?