Not building heat

BTW
if the temp sensor is NOT in the water, it will NOT measure the temp of the water. It will give try to give you the temp of the air above the water, but it's really lousy at doing that.
So if you have used a stack of adapters to make your sensor "fit" well there yago. fix it.
Good point. I'm using a factory cast iron intake and sending unit. I will use my IR thermometer when I get it to work tomorrow and see what It reads.
Thank you!