PS line tee?

I'd put my $1 on hydroboost line.

Pressure sensor port for a/c clutch cutoff

Didn't MileMarker or Ramsey back in the day make a hydraulic worm gear winch that was juiced off the P/S pump?

But that is not how hydroboost is plumbed usually.

I could see something like that being used from a pressure sensor. But my ‘85 with aftermarket air conditioning (dealer installed) used the tach signal. Do you have first hand experience or was it a guess?

That’s a pretty neat idea but this was a base model 2wd c10

So how would that work? You have to crank the wheel hard left or right to get the winch to move?

Power steering pump doesn’t care what direction the wheels are turned to make pressure.

Think about what causes there to be pressure in that line and why just teeing off it to run a winch won't work.

Educated guess. Sometimes they were on the pump, sometimes in the line. Hydroboost rerun tee would be in the top port.

Educated guess, but Toyota on many years had a vacuum implement T'd into the PS that created what amounted to a small vacuum leak to bump up idle under steering load.

I thought of that but creating a small vacuum leak in carb or TBI system is not great for idle quality.

That makes perfect sense. I thought the tee was on the pressure side from the pic