Where is it located? And if I were to put an actual oil pressure guage on this, would I  put the sending unit in its place or is there a better location?

[2015 Z Force 800 53/Trail EPS]

Where is it located? And if I were to put an actual oil pressure guage on this, would I  put the sending unit in its place or is there a better location?

That's the only place to put one-it's the only thing between the two cylinders on the block that has a lead going to it. This is an example, the old ones are up where the newer one are on their side like this. If it were me..I would put a nipple and tee and run both. Remember, its all metric.