Had to change to a Hall sensor, the one on the igniton had only 2 wires...RC EXL ignitions come with 2 different sensor mounts, so it was easy enough to tap the 2 holes to mount it on the other side...And now it uses a Champion RDJ7Y or NGK BPMR6F...Slightly longer and does away with the cup under the spark plug for the shielded cap...