Any with more knowledge of this, jump in and correct me, but I don't believe there's an actual PTO shaft speed sensor.
PTO speed is computed off of engine speed, so the digital dash is always "seeing" the PTO speed, even without it running.
So, either there's a switch in the PTO apply mechanism to "tell" the dash the PTO is actually running, or it will constantly show the PTO speed, when you select that function. (I don't know, offhand.)
Our town has a hydro 186 and a full set of factory shop manuals. If a get a few minutes today I'll stop by the city shop and see what I can dig up on this.
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Today's Featured Article - Identifying Tractor Noises - by Curtis Von Fange. Listening To Your Tractor : Part 3 - In this series we are continuing to learn the fine art of listening to our tractor in hopes of keeping it running longer. One particularly important facet is to hear and identify the particular noises that our
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