Re: How to hook up a water pressure guage
On top of the head, slightly off center to starboard, behind the thermostat cover is a 1/8 NPT slotted head stainless steel plug. Unless it has already been removed and a temperature gauge sender installed, this is the site to put the pressure gauge sending unit.
Simply (Ha, Ha, nothing is ever simple.) remove the plug and screw in the sending unit. This plug is almost always nicely corroded in tight, thank you, and an impact screwdriver and possibly a little heat will help.
Now, if your sending unit is bigger than 1/8 NPT a better alternative would be to drill and tap the pad on the block just behind the stainless plug. There is plenty of metal on this pad so you only need to remember to stop drilling when you break through into the water jacket.
By the way: Below the front of the exhaust cover is a square head 1/2 NPT aluminum plug. I have NEVER been able to remove that plug BUT---I recently acquired a Chrysler 140 with a pressure sender in this hole so someone must have been able to remove the plug.
Never having used a pressure gauge on my engines, I can not tell you what normal pressure would be.
