Power goes to the control unit shown above aswell as sensor connectors (different shape and size per each sensor). The gauges are then daisy chained off this.
You should have a Defi badged rectangular boot pressure sensor near to the boost control solenoid/drivers strut tower.
I'm not sure on the OE fit for the Oil Sensors but likely to be under the alternator and in the block above No,3 between turbo outlet and intercooler pipe.
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