The whole enigine is covered in M12x1.75 threads 🙂
There are three blanking plugs on the RH end of the head - I've got my oil temp sender in one of them, and oil pressure sender in the OE oil pressure switch hole (and done awy with the switch).
You can get adaptors easy enough, but like most good things for the Z22, I had to import them from the US as no-one in the UK did that size when I was looking just over a year ago