Home » Tony’s Tips » Articles » Sending Unit & Sensor Locations for Cummins Marine DieselsSending Unit & Sensor Locations for Cummins Marine Diesels The following pictures will help you locate your engine sending units (senders) & sensors on your Cummins Marine engines. 6BT / 6BTA 5.9 6BT Oil Pressure Sending Unit Location 6BTA Oil Pressure Sending Unit Location 6BTA Coolant Tempurature Sending Unit Location 6CTA 8.3 (Mechanical) 6CTA 8.3 Oil Pressure Sending Unit Location 6CTA 8.3 Coolant Temperature Sender Location QSB 5.9 QSB 5.9 SmartCraft v1.0 Oil Pressure Sending Unit Location QSB 5.9 Coolant Temperature Sending Unit Location QSB 6.7 #1 Oil Pressure, #2 Cam Position, #3 Crank Position Coolant Temp Sensor Common Rail Pressure Sensor Intake Manifold Pressure/Temp Sensor Crankcase Pressure Sensor QSC 8.3 QSC 8.3 Oil Pressure Sending Unit Location QSC 8.3 Coolant Temperature Sending Unit QSL 9 QSL9 Oil Pressure Sending Unit Location QSL9 Coolant Temperature Sender Location QSM 11 QSM 11 Oil Pressure Sending Unit QSM 11 Coolant Temperature Sending Unit