Installing water PSI gauge

[Glenn]

Ok guys. Got my new steering in no problem. Teleflex NFB Pro dual rack. Now I got to to install my water PSI gauge. Teleflex Pro Series 30 PSI gauge. My engine is a 78 Merc 1750 2.0 liter. It says to either hook in to a bypass hose or use a reducer bushing (not included) and hook to a pipe plug hole at top of cylinder block. I can see the plug up top there and it looks like it removes with a 3/8th ratchet. There is a hose that joins the 2 thermostats at the top of each head. Then it goes from the top of the right bank to the bottom right side of the block. Where do I hook this sucker? If I have to hook to that plug on the top is it going to be hard to find an adapter? Thanks for any feedback. Glenn

[Rickracer]

There should be an 1/8" NPT to 1/8" male hose barb plastic elbow fitting in the guage kit, but if not you should be able to get a brass one at most any auto parts store.