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From what I can tell the gauge get's it's information from the ICP sensor on the 7.3L. I honestly have not seen a oil pressure sensor on the 7.3L other than the ICP sensor.
From my manual on the gauge:
Oil Pressure Gauge
The instrument cluster is hardwired to the oil pressure sender unit. The instrument cluster micro-processor monitors the oil pressure data and commands the oil pressure gauge indication with a corresponding movement of the pointer. The oil pressure indicator sender unit consists of a diaphragm and contact points. The contact points are closed with oil pressure causing the gauge to indicate NORMAL oil pressure. With no oil pressure, the contacts open and the gauge indicates low oil pressure.
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Ken
2002 F-350 CCLB 4X4, HD4R100 , Riffraff FRx, Riffraff CAC Boots & PRI's, Bellowed Up-Pipes, 4" Diamond Eye exhaust, Powerslot rotors, ATS Ported Compressor Housing, DP Tuner-F6, Autoenginuity, EEC-V Breakout Box, KCM S.S. HPX Line, S&B Filters intake, Quad Autometer gauge pod, Inovations canopy, Banks Big Head wastegate actuator, 6.0L Trans Cooler, Spin-on Transmission filter with custom bracket, Zoo-dad, Dieselsite Coolant Filter, Cobra 29LTD/NW CB, DVD and always looking to do more....  
Powerstroke Acronyms
TSB Information
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