That be the one marketed by Radio Shack previously. Made by Vellman Electronics. As Mr. Dell respectfully said, it only works on negative ground, and I think 12 volt. My 9N was 12 volt converted before I got it and I stuck with it. I put one of these on and it works great. You need to run two wires out of the distributor--separate the strap from the points to the screw that feeds the coil and one wire from the points and one from the coil screw. This goes to the circuit board along with a ground and hot wire. No condensor. If you run the wires out and put some plugs on them, if the circuit craps out, you can unplug the circuit board, tie the two wires together and hook them to a condensor and ground the condensor and you can be back in business. I made up a little setup to plug in the condensor, but in about three years have never had to use it. Doesn't burn points either. FWIW, JU and his 9N working tractor with lotsa gizmos on it (Position control, 12 volt, live hydraulics, and a few other non original items)
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