Have had the same problem, ETC kicking in 1500-2000 rpm's to early. The answer i got was to try to shield power leads and also mount suppressed plug cables. I have tried to shielded cables, ekstra grounding, I don't want to use suppressed cables as i need moore spark from my Don Zig Mag. As for now I use the old set-up with Autometer rev limiter and a eksternal signal converter for the shift-light and tach, and that works perfect. I would love to see a solution as I have already decided to upgrade to a Hunt H3 mag that puts out 3x the amp compare to the old one.