here's what i got from a guy on another board, a GM tech:Traveller said:Find a pump without a sensor. Some pumps have speed feedback that vary pressure. You get easier steering at slow speeds and firmer steering at higher speeds. If the sensor isn't hooked up you can get firm steering at all speeds.
If you are using a vortech ecu it might have the wiring for the sensor, depending on the year. The sensor is plugged into the bottom rear of the pump.