I tried to start the used ( 3 starts) Ram 750F today that I bought from a guy on here. The problem is that the Temp would never show above 20 deg. C. I think that either the temp probe is bad or there is an ECU problem. While I was setting the ECU up to my TX at home the temp probe wires were getting warm.

What should the resistance be across the temp probe wires? I am a technician but have never used thermocouples at work...

I get 7.8 Ohms across the temp probe. Is this good or bad?