The oil pressure switch is located on the left-hand side of the engine block behind the oil filter housing. Disconnect the wiring plug, and unscrew the switch from the engine block. Be prepared for oil spillage. Installation is the reversal of removal. Use a new sealing washer and tighten the switch to the specified torque. Check the engine oil level and add new oil if necessary. For the oil condition/level switch, drain the engine oil. Remove the fasteners and the engine splash shield. Disconnect the wiring plug, remove the three retaining nuts and remove the switch from the base of the oil pan. Ensure that the oil pan mating surface is clean. Install the switch with a new seal and apply a little thread-locking compound. Tighten the retaining nuts to the specified torque. Install the engine splash shield, and refill the engine oil.