Hmmm... Welp, I don't own a car w/ a dash fuel gauge. Are you able to measure old vs. new? I would think the resistance is obviously needed if it was there originally. I know the sender in the tank provides about 0-90 ohms depending on fuel level. So, that is odd to me to have resistance at both ends... BUT the console fuel gauge has it, too!
Did you try asking on Team Camaro? There are a few true experts in the electrical section of that site!!!