The manual can't right, 4 psi at idle is nothing, it would wipe the crank out on tickover! 65 psi cold sounds like a normal pressure on startup. Warm oil pressure is more important, when the oil is hot the viscosity drops, I'd repeat the test with the engine at operating temperature.
Check the supply or run a couple of cables directly from the battery if you haven't got a meter, if it still won't go then its probably time for a new one.
Transmission speed sensors are used by the Transmission ecu to decide which gear to select, the one on the diff is used by the body ecu for the speedometer and ABS.
There was an old way of defeating the ERG without getting it mapped out using a little circuit to fool the ECU, it may be worth researching it as a see that the tuners in America aren't allowed to delete the EGR anymore??
This picture shows it. I pinched the picture from lost jeeps!
This is the sensors you need to clean, don't be tempted to use anything other than a blast of carburettor cleaner, it's fragile.
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