Hello, I bought this car with bad engine,was able to rebuild using various manuals. The problem I am having is the temp gauge does not move. The sensor that was on the head was broken, it was red and 3 pronged. I ordered a replacement and they sent me a green one. I installed on the head but gauge doesn't move from 40 C. I grounded the single wire to the sensor(3 pronged) and the gauges goes all the way up. Can anyone help. Thanks Steve