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The engine is a Rotax ULS 100HP. The Dynon and the governor are connected to the rotax rpm signal generator. The erratic reading is above and below the actual RPM and sometimes the tacho even goes to zero.

I have an electronic constant speed propeller which is connected to the EMS tachometer wire. Sometimes the tacho readings on the ems are erratic. How can I isolate the governor from the ems and still have the signal going to the EMS and the governor? If I disconnect the governor the EMS works fine.