Water temp sensor

[Macdaddy1]

I have a 327 in my 65c10 which is still in build mode. I want to replace the water temp sending unit in the block. My question is there a wire that runs from the sensor to the back of the dash temp gauge? I went down to the parts store and they sold be a Bosch temp gauge. i could not remove the end that attached into the gauge to see if it would fit into the back of my console. I am not sure how the water temp sensor was originally attache. Any help or insight would be appreciated.