That's so much work to reinvent the wheel there.
An electric pto switch could lock up in the on position and it would be stuck on. If the mechanical pto fails, turn off the tractor, pull off the belt to whatever attachment you are using, and then go into your garage or shed and troubleshoot.
Your ignition switch is the final safety mechanism on the tractor.
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1450- 44A deck,QA-36 snowthrower, 42in front blade No.2 Tiller
70- 38in deck, 42 inch deck
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