Sometimes, to make an omelet, you need to break a couple of eggs. That said, I have seen the pictures where a couple of people have mounted gauge pods center of dash above the A/C outlets. I didn't see any conduits for cables so I guess they drilled a hole (or holes) into the dash. If your intent is to remove them later and restore the car to OEM, you may have to limit the location and size of the holes and plug or cover them. I personally like the location but don't have the will to install anything (lost that initiative many years ago). Have fun, your quite talented in creating those things you wish to install!