Oil Pressure Sensor Removal/Installation - 2.3L

Disconnect the battery ground cable.
Raise the vehicle on a hoist.
Disconnect the wire connector at the sender.

Fig 1: Disconnecting Wire Connector (Sender)
Courtesy of MAZDA MOTORS CORP.
Remove the oil pressure sender.
To install, reverse the removal procedure.
1. Apply sealant to oil pressure sender threads.
  
  Fig 2: Installing Oil Pressure Sender - With Torque Specifications
  Courtesy of MAZDA MOTORS CORP.