Civic EG

I was just wondering if I could just go ahead and drill a hole in my oil sandwich ring, tap some thread in it and install an oil feed line to the turbo?

Or do I have some reeeally silly ideas up here

you might as well get an oil sandwich adapter with more than one fitting unless you have one already. I teed my oil feed line to the oil pressure fitting on the block.

The oil sandwich adapter, i left for gauges.

they are usually made of solid aluminum so drilling would be easy

But I would probably just buy a new one with more ports because I would be worried about messing mine up. If you have the tools and you're confident, then go for it

I've got some skills and a nice amount of quality tools, so that will not be a problem.
I already have 2 holes in the ring, but one for the oil press sensor and one for the oil temp sensor, so it'll need a third hole.

Taking it off and modding it makes cleaning the new thread a lot safer/easier, no metal chips in the oil system

as long as you make an NPT one you are good to go!