Good morning Gentlemen,
Is this port that is plugged on the back of my motor an oil port?
Could it be used for an oil pressure gauge?
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That port was where my stock oil pressure sensor was located on my '88.
When I installed my hypermax kit, that same port was used by their oil feed line AND the stock oil pressure sensor.
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You can see the oil feed line in the middle of the turbo kit, and there is a bend to the drivers side to give the metal some flexibility to the port (behind the pedestal).
Hypermax has a custom adapter tee to all for the oil feed line and the oil sensor. The sensor now sits horizontally to the driver's side of the engine, and you can see it peeking out behind the driver's side up-pipe in the photo above.
Update: I found a better photo of the custom Hypermax oil tee:
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