There is a sensor sticking straight up in the back of the thermostat housing. Can I use this sensor for my autometer electrical water temp gauge?

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So the 3 ports on the throttle body...I currently have the dizzy on the first one, and the next 2 capped off...   I am installing an Autometer mechanical Boost gauge, and if ive been reading right, the line goes to the 3rd nipple which is closest to firewall?   Am I right?