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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