Additional Oil Pressure Switch

RV-12, Rotax 912ULS s/n 6785075

With the Dynon EFIS, my oil pressure is a very small icon and is set up for green, yellow, and red indicators.  I'd like to install a second oil pressure switch that illuminates a red LED if I lose oil pressure.  There is a blocked port on the front of the oil pump that I think would work but need the thread / diameter information.  Does anyone have that information?  Thanks.