You should check the o-ring on the cam position sensor. Oil can leak out of there and drip down to the exhaust manifold or get blown back by the fan. It could also be valve cover gaskets or cam seals. Those are common problems. After checking those, I would look at the oil pressure sender and the turbo oil line seals.
As far as your oil pressure, once warmed up, you should be at 4-7 psi at idle and 35+ at about 3000 RPM.
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1992 Supra 7MGTE A/T w/Sunroof Super Red/Shadow Gray
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