[TKCR]

I had that also on my truck when I bought it. Had an aftermarket temp sensor & gauge. It didn’t work, so I took it out and put the correct sensor in the block. Found the green wire that was supposed to be on the temp sensor just hanging in the engine room. And guess what? The stock temp gauge was working. Not sure why someone would go to that trouble.
And from the pic of the interior gauge, you can see they also had a radio mounted under the dash also. So I took that out and installed a Custom Auto Sound in place of the stock radio. So I’m thinking they added that radio because the stock one didn’t work anymore. But after just doing the temp sensor, I went ahead and hooked the stock radios wires back up, and the stock radio did work! But I went ahead and installed the Custom Auto Sound unit, since I already had it all unpacked, ready to install.