jaybird81

My water temp gauge was functioning fine when I had my stock motor in. I pulled the motor out of my 81 and replaced it with a 350 from a 72 Chevelle. I think I figured out what controls the temp gauge, but had a question. The original motor has 2 "sensors" one in each side head. The drivers side has one terminal between the 1 and 3 cylinder, and the passenger side has a 2 terminal (terminals are side by side) between the 6 and 8 cylinder. I didn't know which or if both control the gauge. But after reading another post am I correct in saying the one on the passenger side controls the electric fan? If that is correct then the one on the drivers side must control the gauge, correct? Now the motor I put in out of the chevelle has a sensor on the drivers side head in the same location as the Vette motor. The only difference is the one on the chevelle has 2 terminals, in an "L" (Meaning the terminals are not side by side). Can I use the sensor all ready in the motor to work my gauge or do I need to take the sensor out of the original motor and put it in the new motor? If I can use the sensor that is all ready in the new motor what do I do about the sensor having 2 terminals and the wire in the car having one?

wombvette

Why would you not just use the original sensors for the car?

jaybird81

Yes, I agree. However, I thought I would ask about getting the one in the motor all ready to work, because I am concerned they might not be the same thread. I figured I would just ask if it was possible to get the two terminal to work.

0Willcox Corvette

You are correct, the sender on the passenger side is for the electric fan, the one on the driver side is for the dash unit. Use the original sender from the original engine.

CaseyJones

The one from the Chevelle was probably for a light or for a gauge that uses a different ohm-rating. Use the proper Corvette sending unit for your car so you'll know that your gauge works correctly.

jaybird81

thanks guys, looks like I will not try and get the one in there to work, and just go with the original one. Should the tread be the same?

0Willcox Corvette

They both should be 5/8 npt... and Casey is correct, the two wire one from the chevelle will not work your gauge properly.