Water Pressure "Tee" size '85 GT 150

[Stut]

Guys,

Ok, so I bought a water pressure gauge. When I go to install it, I realize the kit is missing the "Tee". (I bought and old stock gauge to match the old boat...)

If I'm correct, the "Tee" should go in the 'pee' tube after it exists the block, and before it goes into the cowling and 'pees' out.

So, my question is, does anyone know what size "Tee" I need? I believe the two straight nipples are of one, larger size, and the third nipple is of a smaller size for the gauge tube.

Any help?

Thanks!!

Stone

[RUSTY63]

Part number 913435, I think it is 5/32.

[DoferGofer]

What is the tipical water pressure for this engine?

[ChampioNman]

Over 20 psi WFO.