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1972 merc 850 water presure sensor

H

Hugo K

New member
Hello
I want to install a water pressure sensor on my merc 850 1972 4C and I'm wondering where I can tap it into. You want it as high up on the water jacket as possible, but I don't seem to find anything to plug it in to.

Any of you have any knowledge about installing one on such an old mercury?

//Hugo
 
On the rear of the block, on the water jacket cover through which the spark plugs protrude. On later model engines, there is a 1/8 pipe threaded hole with a brass screw plug which is removed for installation of such things.

On a different engine I have bored and tapped a 1/8" NPT hole for mounting such. No big deal just clean up your cuttings as you go. Water pressure isn't over 15 psi so there isn't a lot to worry about other than get off to the side of the plate, not along the vertical center line.....say, take the top plug, and at a 30-45* angle toward the top right corner of the plate, half way between the spark plug and the corner plate mounting bolt would be a good place.
 
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