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Erratic RPM readings

in 912 / 914 Technical Questions 7 years ago
I am a new (to me) Rotax 912 ULS owner installed on a Titan Tornado S aircraft. At approximately 5000 and above RPM, the tach is very erratic. The tach itself is in the EFIS which is an MGL Enigma. I thought I read somewhere that installing a 220 ohm resistor from the RPM output lead to ground would stop the erratic movement of the tach. Does anyone have any recommendations on how to eliminate the erratic RPM readings?
Thanks very much.
Dennis
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