Massey Ferguson 533 PTO sensor help

[Kfrazier45594]

I have a Massey Ferguson 533 and am experiencing problems with the pto sensor. I inherited this tractor and apparently the previous owner had bypassed the pto engaged sensor. While using it the other day, I cut it off and went to restart but the pto light engaged is on the instrument panel not allowing me to start. I’m dead in the water and am attempting to get this corrected. I have ordered a new sensor but don’t know what wires go where. Any advice on how to get this cranked is much appreciated.

 

[TractorTech]

You could test to see when the switch is normally open or closed. Then wire two wires together and see which complete the circuit.
Don‘t know why there are three wires.