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I had to add a little R-134a to our Mazda 3 and figured I would check my High and Low Pressures on the 1998 SC300.

I found the High Pressure Port and the Sight Glass easy enough. You can see them in the 1st photo.

But, I can not find the Low Pressure Port anywhere! I looked at the back side of the A/C Compressor (2nd and 4th photo) and below the battery (3rd photo).

SupraMn

Passenger side of the engine bay, under the intake facing the exhaust manifold.

flash9

Thanks to SuperMn, I was able to find it. To help anyone who comes across this Post in the future, here is a photo of its hiding place.

Note: The Low Pressure A/C Port is just below the Anti-Lock Brake Controller.