I recently purchased an EM cobra that was built with a magneto system in it. When you are idling or driving that tach bounces around 2,000 rpm in variation than what I believe it should be at. The seller told me he has tried fixing that tach but his mechanic told him it was because of the magneto and that was the best it would be. Any advice? I know nothing about those systems. Should it bounce around as much as it does? It is a new Pro Comp gauge so I wouldn't think it wasn't that. Is it because the high voltage pulse that is create? I know enough to get into trouble probably.
