Cheers,

And what about keeping the factory plug/sensor and connecting my gauge to the rear plug under tmic near turbo?

This would be the easiest plug to connect an oil temp or oil pressure gauge to IMO as you wouldn't need to get a T piece and remove the alternater "shudders at the thought"

Or is the rear spot no good for oil pressure?

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1989 Legacy GT --> 2001 GD WRX --> 1999 GF8 WRX --> 2001 GD WRX