Bought a set of new SS tach and gauges. I am having problems with the temp gauge. The instructions say to remove the resistor from the old large idiot light gas gauge and mount vertical on the temp gauge. When I do that the readings are very low compared to a known good original temp gauge. On the original 270ohm = 100 deg, 75ohm = 210 deg and 50 ohm = 250 deg. The new gauge reads the same WITHOUT the resistor but with it reads 70-80 degrees cooler. The kit did come with a temp sender. Anyone know if the sender is that much different than a original?