Which Oil pressure port for electronic gauge install?

[Metricquartz]

I will be installing a oil pressure electronic gauge in my 19 Roxor, Looking for information on which port works best to use, The one on the back of block near bell housing M20 X 1.5 threads or to piggy back the Roxor sensor with a tee M12 X 1.5.

 

[CJ2Rox]

That's the one I used. The one infront of the bell housing to the left of the oil filter. It's kinda a crappy to get to position had to get my GF with smaller hands to get the treads going. Lot alittle oil once I removed the plug.