We recommend a complete package for best results. 12 volt package consists of the electronic ignition unit, ThunderVolt III 55,000 volt coil, resistor to match the coil, 8mm spark plug wires to fit that model tractor and set of spark plugs in the correct heat range for your application. 6 volt package includes the 6 volt electronic ignition unit, 6 volt coil, 8mm spark plug wires to fit the tractor and set of spark plugs in the correct heat range. PACKAGE NUMBER REFERS TO NUMBER OF ELECTRONIC IGNITION UNIT THAT FITS YOUR TRACTOR'S DISTRIBUTOR.
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