64 cuda 273 temperature sender resistance?

Might be right - they're listing the resistance at a specific temperature, instead of giving the actual range of the sensor for a given temp range. I couldn't find that part number because Napa doesn't have the Barracuda listed as a 64 model... but I did find it under the Valiant. I'll probably call around this weekend and find a Napa with that part number. And possibly get an autometer electric gauge and an NPT tee fitting. =)