On the 2.5L there is a pressure switch that revs the engine if you crank the wheel at idle. When you start to turn the wheel, you should see the tach climb just a touch. The straight six doesn't have this because it has more nuts at idle.
Then again, this might be something only on newer YJs. Look for a tumor on the PS pressure line right next to the pump. It'll have some wires going to it.
1995 YJ Rio Grande, 2.5L Low Output Engine
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