Ok fellas I really need help with this still haven't figured it out. So here is what is exactly going on. My 93 caprice 305 started running bad and check engine light came on so I read the codes. Code 15 (coolant sensor or circuit/ low temp indicated) and code 23 (intake air temperature (iat) sensor circuit). I changed the intake air temp sensor. That code cleared. Changed plugs wires cap rotor coil and thermostat. It was time for a tune up. Then went to change the coolant sensor on the left side head and the new one is different. The prongs where the pigtail plugs in isn't the same. It plugs in but now my temp gauge doesn't work. I've checked every parts store in town and they all have the same sensor that isn't the same as the one I pulled out of my car. But when I put the new coolant sensor in the code went away and my car ran great but temp gauge wasn't working. Does anyone have any idea of where to get the right sensor or do I need a dif pigtail. And will changing the coolant temp sensor on the intake next to the thermostat housing fix it. Please I need help asap my impala is in my body shop and I'm stuck with one car.