Understand. Yep, I wracked my brain trying to come up with reasons and, reevaluating my installation, what you describe is most plausible. It would certainly underscore my first post. I know about keeping the RPM sensor wiring separate or isolated and I may have experienced a case of brain fade on this one and routed it too close. I'll get on it as soon as I get the turbine back from Bob Price and shut down the wild goose chase we've been on. Thanks for the reply and encouragement.