pi intake

alright, i know there alot of post about pi intake swaps on npi cars, but i couldnt find the exact answers to my questions, so plz help me out again. I know i need to drill and tap another sensor hole for my two temp sensors, but how safe is it to do that, because there is no bung there and is seems like pretty thin aluminum. or is there another way? also i know you guys have used silicone around the coolant passages but what gaskets are you using(npi or pi)? Also are u just putting silicone around the passage and that is it or is there something special i need to do. Any tricks would be very helpful and appreciated. i only want to do this once so i want to do it right. thank you :SNSign: