i found thsee pics from what i took a while ago. this is the "sensor" which goes to the pcm and yes your right that it is next to the water neck and has a yellow and a black wire. this IS NOT used for your gauges. i may be misunderstanding what your asking but you shouldnt need this sensor on your new motor as it should already have one. you will need the "sender" which has a single dark green wire going to the connector and the sender itself only has one pin on it even though it looks like its made for a two pin. the sender is what goes to the gauge and it is located on block on the driver side of your old 350. you will need to retain that sensor or buy a replacement if yours isnt working/lost it, utilizing a metric to american adapter. 12mm x 1.5 to 3/8 NPT. idk how your psi harness is wired but i reworked my own and i traced the dk green from the gauge to confirm i had the correct wire. hope thats what you were asking...
btw, i dont have any pics of my SENDER or connector for it off hand otherwise i would post it so you know what you should be looking for. sorry. maybe somone else has some.
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