The switch is installed either in the pump or in the fluid line near the pump. Begin by disconnecting the cable from the negative battery terminal. Next, locate the Power Steering Pressure Switch and disconnect the switch electrical connector. Place a drain pan or rags under the switch, then unscrew the PSP switch, being prepared for some power steering fluid to leak out. Installation is the reverse of removal, and after completing the installation, check the power steering fluid level and add fluid as necessary.