this is the type thing you are looking for....
you take the sensor out of the block and screw it into the end of this fitting, then screw the whole thing into the block, then screw your oil press gauge fitting into the hole on the side....
now you can find them w/ one hole or two holes, the two holed fitting is for an oil feed for a turbo and a gauge at the same time, if this is the route you go be sure to get the two holed one, might be a couple bucks more but it gives you room for expansion turbo wise at a later date...and it comes w/ a screw in plug for the second hole if it isnt being used
i used one of these fittings on my old coupe w/ a mechanical gauge and a t25 setup....worked perfect, never leaked or anything of that nature