i noticed you used a brass T fitting for the oil pressure sending unit. I hope you didn't T it straight to the block cuz those brass fittings break under stress. i had one break in my block and that was a real pain. if you can use a short stainless steel braided line then T it from there. this allows the brass T not to be affected by the engine vibrations. Or i think nissport has a strong billet piece they make for that or you can get a hard anodized T fitting. Anything that is stronger than that brass.