Has anyone ran into problems with the Avisport 3 1/8 Tach and hour meter combo or the 3 1/8 tach only? We have had to replace 2 of the tach and hourmeter combo now with less than 10 hours on them. They just stop working. So we got just a regular Avisport 3 1/8 tach and the it doesn't work very well. Its sluggish and when you shut of the plane the needle stays at 200 RPM. Is there a better brand of Tach to use with the Rotax 912?