SAVAGEJIM

If I remember correctly, the speed sensor needs to be mounted such that is clocks your flywheel, so the senser magnet needs to be mounted to the flywheel, and the sensor part needs to be mounted somehow to the shroud of the flywheel such that it points to the magnet.

Here is a problem I foresee: The Spektrum sensor senses a magnetic field as the magnet passes under it. Our gasser engines have a magnet built in for the mageneto to fire the spark plug.

So, try this expririment: Dont put the little Spektrum magnet on the flywheel. Instead, mount the RPM senser in the shroud, turn the flywheel, and see of the sensor will read the magnet that is already on the flywheel. If so, use that, and as your gasser runs, the Spektrum should be able to count the RPMs just like it would if the tiny magnet were on there instead.