Boost Gauge Connection

I am running a mechanical stack boost gauge and want to fit an electronically one in its place as they are more accurate. I need to find a place to read the vacuum but I need to use either an M10 x 1 or 1/8 NPT connection.

Anyone got any ideas?

 

Drill and tap on manifold?

 

As above, drill and and tap underneath manifold where 1 of the nipples are, this is what I was told anyway

 

Ok guys thanks, thats another job to add to the list lol.