cooling temp help

I just picked up an 87 b2000. the temp guage wasnt working so i checked the sensor and nothing was plugged up to it. my problem is i have checked everywhere for a plug to plug into it but cant find anything. if i have to run a wire somewhere thats fine but where do i need to run it to any help would be awesome
Thanks

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i know where the sensor is it looks like it is a round plug. but there are no round plugs in the wiring harness i have looked everywhere under the hood in the wire harness and cant find anything. there are two square plugs but none will fit a round conector went to a pull a part tuesday and all of the mazdas there had round plugs but i couldnt see where they went any help would be great im stumped

Check at the bottom of the radiator I know there is 2 little round plugs down by the drain plug.

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and remind me to get a pic for you tomorrow

I agree with nonamedsomebody. There is a wire that connects to a round plug on the bottom of the radiator.

i checked on a friends truck and found about where the wire should go and started checking wires. this is gonna sound weird maybe but somone had hooked the wire up to the o2 sensor. y i dunno now i have the wire hooked up when its grounded out the guage fully sweeps but when im driving it barely moves off cold. changed the sensor still no help. also where does the 02 sensor hook up.

wire from the o2 sensor goes around the back of the block,alongside the passenger side of the head and plugs into a square green recepticle under the front of the intake manifold.That wire goes into the computer and allows the computer to "read" oxygen content of the exhaust gas and adjust the factory carb.Dont need it if u get a Weber carb.BJ

From what I understand, this plug is for the choke heater on the OE carb.

so i have put alot of thought in this i mean hours of my time thinking about all these wiring isues for this o2 sensor and and the countless times i have fixed pain in the butt vacuum leaks im just gonna get a weber. sounds like the best thing to do. but does anyone have any ideas on the cooling temp not working