The oil pressure sensor is on the back of the block beneath the intake manifold. You have to tap the block to install the oil pressure sensor that came with your guage. You can either buy Greddy's oil filter sandwich or you can tap it with brass fittings. You cannot use the stock oil pressure sender as it only tells if the oil pressure is high or low, not the exact amount.

As for the vacuum guage, you need to tap the vacuum line going to the fuel pressure regulator. Just cut it and then put the tap in there.

Search next time since I have covered this topic over 4 times this week. Good luck.