I have recently built the po man's electric brew rig and am having problems with my new thermocouple. It is a K type thermocouple that is hooked into a T on the mash tun valve. It is hooked up to an led readout, but i am getting weird readings. When I start up the led it gives me a wrong temperature reading, and then slowly starts to increase. I left it on overnight and came back the next morning only to find it reading 500 degrees! I tried to do some research on the internwebs but couldn't find anything. Any ideas?