Have a pair of 8v92TA with DDECs attached to Twin Disc MG-5111 Deep Case (DD 5111V DC) marine gears. These engines are Electronically controlled with Electronic Control Modules (ECMs) for both Engine, Gears & Controls.

Issue: Starboard gear pressure reading 0 PSI but transmission works as normal

Trouble Shooting to date:
- Oil pressure sending unit (Detroit Diesel Part #: 23520795 (Transducer)) cleared of issue. Swapped out and tested on Port main gear and pressures reads as normal.
- Placed Port Main gear sending unit on Starboard Gear and reading 0, but transmission works as normal
- Connected manual pressure gauge directly to Starboard Gear and pressures read as normal
- Tested three wires from ECM to Starboard transducer:
○ Wire Sensor power supply 5vDC - Checked out w/5 volts
○ Wire Sensor Return - Not sure how to test thoughts??, same OHMs reading as port engine
○ Wire Pump pressure sensor - Not sure how to test thoughts??, same OHMs reading as port engine
○ Ground appears good from transducer to engine block
- Checked for obvious loose wires to the Eltreic Control Module (ECM) and all appears normal.
- Need additional suggestions to trouble shoot and diagnose....help!!!