I installed one on my smta,this tractor is 12 volt neg ground factory stock option and is used for antique tractor pulls.Boy what a difference it makes,I did switch to auto lite plugs and gap is set at 45 and there is a difference in increased horse power. You really do not have to change the coil just install and see what happens,at a latter date if you want to up grade to a high out put coil feel free. Money well spent.Paul
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