I used a sandwich plate for the oil it's been there for 2 yrs now and i don't have any leaking. For water temp i used
hose adaptor and i'm not real happy with it. It reads about -10°F from the stock sensor and it doesn't react until the t-stat opens. If your car is stock T into the throttle body hose, you can get all the parts you need from the hardware store for about 10$. If you want to go big you can drill and tap your water pump housing. Boost is easy there are 2 nipples on the UIM you can tap into.