I bought a reproduction temp gauge from Ricks a couple of years ago,for my 68 Camaro(the factory gauge setup), and it read all the way over on HOT as soon as I started the engine. I was looking at an older catalog recently, and discovered a note that said not to use the resistor on the back of the factory gauge. Upon reading this, I tore apart my gauges again, and I see two pieces mounted to the back of the gauge. One looks like a ceramic type piece, kind of thick and heavier than the other piece, which is much smaller and thinner. Which piece, or is it BOTH pieces that have to be removed to make it work properly? Thanks in advance for any help in this matter, as I am clueless when it comes to electrical issues.