Dave , OK, that should work fine.....but have you run the engines yet with the twin sync plugged in? If it lights the green LED's when you roll the engine over, then it's talking to the twin sync. If you have any issues, first confirm that the hall sensors have not been dislodged from vibration. You should have between 1/16' and 1/8" air gap between the hall sensor and magnet. Use red loctite on the mount bolts because they are permenant...... Let us know. Rick