F100 water pressure gauge

[Bassastor]

I have a 99 F100 that I want to hook a water pressure gauge up to but I can find no place on the powerhead that I can hook a hose to that I can run to my gauge. Am I going to have to drill and tap for a fitting or am I not seeing something I should be?????

[boats.net]

Here is location of water port,
F75-F100 WaterPort.JPG