I haven't figured out the perfect location for a boost tap yet, but I'm leaning toward the body of the FCV - It can be separated from the rest of the intake path, so I can keep crap out from the intake itself while I drill and tap it, and it provides a metal framework for the probe. For the oil pressure, that is MUCH easier - Right where the existing sensor connects.
Its gonna be messy if you try this while the oil is still in the engine, so do an oil change. Directly behind the oil filter, pointing toward the front of the engine is the engine's sensor. Unscrew that, and install a brass 1/8" nipple with a brass "T" section. Thread the engine sensor back in, and add your own on the other open connection. Bingo, dedicated oil pressure. Make sure you use a "electrical remote sensor" kind of gauge, not the cheap ones that you have to run oil into the cockpit for. Imagine if that hose broke.
