I am assuming that the oil pressure sensing unit is
really just a pressure switch. Check for continuity
across the switch with the engine running and off.
>From the Bently manuals it looks like a normally
closed switch. So you should have continunity with
just the ignition on. With the correct oil pressure
the switch opens and the light so out. Now all you
have to do is trace the wirings. Without a spectific
wiring diagram it not a easy task. You have replaced the
all major components it all that is left is the electrical
wiring. Good Luck
Dave Simpson
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